--- title: "Resend connector: setup and compatibility | Stacksync" description: "Resend integration guide: plan Contacts and Email events, record identity, setup, and compatibility." canonical: https://www.stacksync.com/connectors/resend last_modified: 2026-09-15 --- Business productivity · Two-way sync platform # Resend integration. Connect your Resend workflow to the systems your business runs on. Work with a Stacksync engineer to confirm the connection and required operations, starting with Contacts and Email events. - Review your systems with an integration engineer - Get a scoped implementation and validation plan Technical workflow review ## Bring one workflow. Leave with a technical plan. An engineer will assess the required records, access method, and read/write operations before recommending an implementation. - **Emails** - **Contacts** - **Audiences** **What to bring** Bring a sample record, the other system, and the change your team needs to automate. [Talk through your workflow](https://www.stacksync.com/book-a-demo?connector=resend) ## Adopted by fast-scaling companies moving mission-critical data in real time - Gladia Case study - IDEXX - MedPro Migrated from MuleSoft - Eko Case study - Ubicloud - Vimeo - Codility Migrated from Celigo - ACERTUS Migrated from Heroku Connect - Syringa Migrated from Matillion - Truora - Streaam Case study - SEAL SQ - Rinsed Migrated from Fivetran - IA Capital Group Case study - Meter - Golden Pear Funding Migrated from Celigo Record types ## Resend records to discuss. These Resend record examples help scope a technical review. They are not a list of verified Stacksync operations. Emails Identify this record type and the operation you need to review with Stacksync. Contacts Use a stable person/contact ID and an explicit cross-system lookup. Email can change and can be shared, so treat it as a matching clue rather than a universal key. Audiences Identify this record type and the operation you need to review with Stacksync. ### See 3 more record examples Broadcasts Identify this record type and the operation you need to review with Stacksync. Domains Identify this record type and the operation you need to review with Stacksync. Email events Keep the source event ID, source system, occurrence time, and ingestion time. Use an explicit duplicate-detection key. Connection setup ## Resend connection requirements. Review Resend access and the operations your workflow needs with Stacksync. The vendor API reference below can help your administrator prepare for that discussion. ### Prepare access and scope for the engineering review - Identify the Resend account, edition, environment, and business objects the integration must access. - Confirm a Stacksync connector or implementation path for Resend, including read/write support, authentication, and initial-load limits. Integration design ## Match records and fields for your Resend integration. Choose the object and business event that matter to the workflow. Separate record updates from side effects such as notifications, approvals, and file creation. Use these design questions to prepare a representative record and the business rules your integration must preserve. ### Explore record matching and field-mapping checks Resend **Source record ID** Keep the account and record type Record matching **Source ID ↔ destination ID** Link the same record across systems Selected destination **Destination record ID** Preserve its local key and rules *Conceptual identity model. Keep source and destination IDs linked so an update reaches the right record. Confirm the supported sync direction separately.* Match the same record in both systems Use a stable person/contact ID and an explicit cross-system lookup. Email can change and can be shared, so treat it as a matching clue rather than a universal key. Load related records in the right order Resolve the organization relationship and any owner or consent references required by the destination. ### Mapping checks by record type #### Contacts Confirm object support with Stacksync Identity Use a stable person/contact ID and an explicit cross-system lookup. Email can change and can be shared, so treat it as a matching clue rather than a universal key. Fields to consider Source person ID · Display name · Email address · Organization reference · Consent state Related records to resolve first Resolve the organization relationship and any owner or consent references required by the destination. Test before going live Test an email change, two records sharing an email, and a person associated with multiple organizations. #### Email events Confirm object support with Stacksync Identity Keep the source event ID, source system, occurrence time, and ingestion time. Use an explicit duplicate-detection key. Fields to consider Source event ID · Event type · Occurred-at time · Related record ID · Payload version Related records to resolve first Resolve the related customer, user, or transaction identity without assuming the event ID is the entity ID. Test before going live Deliver the same event twice, then an older event after a newer one; verify duplicate and ordering behavior. [Download the field-mapping workbook (CSV)](https://www.stacksync.com/downloads/sync-planning/field-mapping-workbook.csv) to capture the actual API fields, matching keys, owners, and test results. Use it as you build with your team or a Stacksync engineer. Setup and validation ## Validate the Resend integration in four steps. An update reaches the intended record, preserves its relationships, and performs each approved side effect once. ### View the four setup tests and expected results 1. ### Verify Resend credentials and resource scope After confirming an implementation path, validate the selected access method with the intended account, region or workspace, and resource scope. Record the credential owner and renewal procedure, then demonstrate access to one selected object. **Expected result:** The selected resource is accessible through the approved credential, with the renewal and revocation procedure assigned to an owner. 2. ### Test record matching for Contacts Using the implementation established in the compatibility review, preserve the selected source ID and resolve the required references. Test an email change, two records sharing an email, and a person associated with multiple organizations. **Expected result:** An update reaches the intended record, preserves its relationships, and performs each approved side effect once. 3. ### Test the operation your workflow needs Review one Resend record with a Stacksync engineer. Confirm how it should reach the other system, how often it must update, and whether your workflow needs reads, creates, or updates. Test those operations before expanding the integration. **Expected result:** The selected operation is confirmed, addresses the intended record, and exposes rejected values for repair. 4. ### Test recovery and name the support owner For the confirmed implementation, interrupt a non-production transfer and restore access. Establish whether recovery uses the current source state or a stored historical event, and verify that repeated delivery preserves record identity. **Expected result:** The records have the expected current values, repeated delivery creates no duplicate business record, and your team knows who handles unresolved errors. [Use the production-readiness checklist](https://www.stacksync.com/blog/two-way-sync-production-readiness-checklist) to record test results, assign support owners, and agree on when to go live. Troubleshooting ## Troubleshoot your Resend integration. ### Diagnose record matching, delayed changes, and rejected operations A Resend record appears under the wrong destination record Use a stable person/contact ID and an explicit cross-system lookup. Email can change and can be shared, so treat it as a matching clue rather than a universal key. Resolve the organization relationship and any owner or consent references required by the destination. Repair the ID relationship before repeating the operation. The first load looks correct but later results differ Confirm the selected Resend implementation’s change-detection method for Contacts and Email events. Compare later changes with the original source rather than using a successful initial copy as evidence of ongoing capture. One operation succeeds while another is rejected Check the specific Resend object, field permissions, required references, and allowed operation. A successful read does not establish that a create, update, deletion, or business action is available. [Review retry, replay, and recovery behavior](https://www.stacksync.com/blog/two-way-sync-error-handling-retries-replay) before repeating an operation that may already have succeeded. [Review your Resend workflow with an engineer](https://www.stacksync.com/book-a-demo?connector=resend) ## Resend integration guides - [checklist Two-Way Sync Production-Readiness Checklist](https://www.stacksync.com/blog/two-way-sync-production-readiness-checklist) - [guide Two-Way Sync Field Mapping Workbook](https://www.stacksync.com/blog/two-way-sync-field-mapping-workbook) FAQ ## Resend connector FAQ ### How should I plan an integration with Resend? Choose the object and business event that matter to the workflow. Separate record updates from side effects such as notifications, approvals, and file creation. Confirm the connection and read/write operations with Stacksync. Start with one workflow, agree on which fields each system owns, then test initial data, later changes, and recovery before expanding. ### Can the Resend connector write changes back? Write-back support is not established for this connection. Review the Resend records and fields you need with a Stacksync engineer, then test the required operation with a representative record. ### Which identifiers should I preserve for Resend data? Use a stable person/contact ID and an explicit cross-system lookup. Email can change and can be shared, so treat it as a matching clue rather than a universal key. ### Which related records should I load first for Resend? Resolve the organization relationship and any owner or consent references required by the destination. ### How do I validate Resend changes after the initial load? Test an email change, two records sharing an email, and a person associated with multiple organizations. An update reaches the intended record, preserves its relationships, and performs each approved side effect once. ### What will we cover in a Resend integration demo? Start with one workflow and a sample record from Contacts and Email events. We can review how to identify the record, connect related data, set the update direction, and test recovery. Include the person who owns the source system and anyone who will maintain the integration; you do not need a finished requirements document. ## Explore Resend connections Choose the other system in your workflow. Each guide explains the connection options, available operations, field mapping, and setup checks for that pair. ### Start with these integration guides - [Google Cloud Platform and Resend](https://www.stacksync.com/integrations/google-cloud-platform-and-resend) - [Firebase and Resend](https://www.stacksync.com/integrations/firebase-and-resend) - [Resend and Rockset](https://www.stacksync.com/integrations/resend-and-rockset) - [Resend and Supabase](https://www.stacksync.com/integrations/resend-and-supabase) - [Microsoft 365 and Resend](https://www.stacksync.com/integrations/microsoft-365-and-resend) - [Resend and Slack](https://www.stacksync.com/integrations/resend-and-slack) - [Resend and Twilio](https://www.stacksync.com/integrations/resend-and-twilio) - [Customer.io and Resend](https://www.stacksync.com/integrations/customer-io-and-resend) ### CRM · 30 - [Resend and 6sense](https://www.stacksync.com/integrations/6sense-and-resend) - [Resend and Affinity](https://www.stacksync.com/integrations/affinity-and-resend) - [Resend and Attio](https://www.stacksync.com/integrations/attio-and-resend) - [Resend and Chorusai](https://www.stacksync.com/integrations/chorusai-and-resend) - [Resend and Close](https://www.stacksync.com/integrations/close-and-resend) - [Resend and Copper CRM](https://www.stacksync.com/integrations/copper-crm-and-resend) - [Resend and Dun & Bradstreet](https://www.stacksync.com/integrations/dun-bradstreet-and-resend) - [Resend and Freshsales](https://www.stacksync.com/integrations/freshsales-and-resend) - [Resend and Freshworks CRM](https://www.stacksync.com/integrations/freshworks-crm-and-resend) - [Resend and Gong](https://www.stacksync.com/integrations/gong-and-resend) - [Resend and HubSpot](https://www.stacksync.com/integrations/hubspot-and-resend) - [Resend and Infor CRM](https://www.stacksync.com/integrations/infor-crm-and-resend) - [Resend and Insightly](https://www.stacksync.com/integrations/insightly-and-resend) - [Resend and Intercom](https://www.stacksync.com/integrations/intercom-and-resend) - [Resend and Kommo](https://www.stacksync.com/integrations/kommo-and-resend) - [Resend and Pipedrive](https://www.stacksync.com/integrations/pipedrive-and-resend) - [Resend and Salesforce](https://www.stacksync.com/integrations/resend-and-salesforce) - [Resend and Salesloft](https://www.stacksync.com/integrations/resend-and-salesloft) - [Resend and SAP Sales Cloud](https://www.stacksync.com/integrations/resend-and-sap-sales-cloud) - [Resend and Seismic](https://www.stacksync.com/integrations/resend-and-seismic) - [Resend and Shopify](https://www.stacksync.com/integrations/resend-and-shopify) - [Resend and SugarCRM](https://www.stacksync.com/integrations/resend-and-sugarcrm) - [Resend and Twenty CRM](https://www.stacksync.com/integrations/resend-and-twenty-crm) - [Resend and Veeva CRM](https://www.stacksync.com/integrations/resend-and-veeva-crm) - [Resend and Vitally](https://www.stacksync.com/integrations/resend-and-vitally) - [Resend and Vtiger CRM](https://www.stacksync.com/integrations/resend-and-vtiger-crm) - [Resend and Xactly](https://www.stacksync.com/integrations/resend-and-xactly) - [Resend and Zoho CRM](https://www.stacksync.com/integrations/resend-and-zoho-crm) - [Resend and Zoho SalesIQ](https://www.stacksync.com/integrations/resend-and-zoho-salesiq) - [Resend and ZoomInfo](https://www.stacksync.com/integrations/resend-and-zoominfo) ### ERP · 10 - [Resend and Acumatica](https://www.stacksync.com/integrations/acumatica-and-resend) - [Resend and Brightpearl](https://www.stacksync.com/integrations/brightpearl-and-resend) - [Resend and Deposco](https://www.stacksync.com/integrations/deposco-and-resend) - [Resend and Dynamics 365 Business Central](https://www.stacksync.com/integrations/microsoft-dynamics-365-business-central-and-resend) - [Resend and Microsoft Dynamics GP](https://www.stacksync.com/integrations/microsoft-dynamics-gp-and-resend) - [Resend and Microsoft Dynamics NAV](https://www.stacksync.com/integrations/microsoft-dynamics-nav-and-resend) - [Resend and NetSuite](https://www.stacksync.com/integrations/netsuite-and-resend) - [Resend and Odoo](https://www.stacksync.com/integrations/odoo-and-resend) - [Resend and SAP](https://www.stacksync.com/integrations/resend-and-sap) - [Resend and SAP Business ByDesign](https://www.stacksync.com/integrations/resend-and-sap-business-bydesign) ### Database · 14 - [Resend and Airtable](https://www.stacksync.com/integrations/airtable-and-resend) - [Resend and Amazon DynamoDB](https://www.stacksync.com/integrations/dynamo-db-and-resend) - [Resend and Amazon DynamoDB](https://www.stacksync.com/integrations/amazon-dynamodb-and-resend) - [Resend and Amazon RDS](https://www.stacksync.com/integrations/amazon-rds-and-resend) - [Resend and AWS Aurora MySQL](https://www.stacksync.com/integrations/aws-aurora-mysql-and-resend) - [Resend and DuckDB](https://www.stacksync.com/integrations/duckdb-and-resend) - [Resend and Firebase](https://www.stacksync.com/integrations/firebase-and-resend) - [Resend and MongoDB](https://www.stacksync.com/integrations/mongodb-and-resend) - [Resend and MySQL](https://www.stacksync.com/integrations/mysql-and-resend) - [Resend and Postgres Heroku](https://www.stacksync.com/integrations/postgres-heroku-and-resend) - [Resend and PostgreSQL](https://www.stacksync.com/integrations/postgresql-and-resend) - [Resend and SAP HANA](https://www.stacksync.com/integrations/resend-and-sap-hana) - [Resend and SQL Server](https://www.stacksync.com/integrations/resend-and-sql-server) - [Resend and Supabase](https://www.stacksync.com/integrations/resend-and-supabase) ### Data warehouse · 10 - [Resend and Amazon Redshift](https://www.stacksync.com/integrations/amazon-redshift-and-resend) - [Resend and Amazon S3](https://www.stacksync.com/integrations/aws-s3-and-resend) - [Resend and Apache Druid](https://www.stacksync.com/integrations/apache-druid-and-resend) - [Resend and Azure Synapse Analytics](https://www.stacksync.com/integrations/azure-synapse-analytics-and-resend) - [Resend and BigQuery](https://www.stacksync.com/integrations/bigquery-and-resend) - [Resend and ClickHouse](https://www.stacksync.com/integrations/clickhouse-and-resend) - [Resend and Databricks](https://www.stacksync.com/integrations/databricks-and-resend) - [Resend and Google Cloud Platform](https://www.stacksync.com/integrations/google-cloud-platform-and-resend) - [Resend and Rockset](https://www.stacksync.com/integrations/resend-and-rockset) - [Resend and Snowflake](https://www.stacksync.com/integrations/resend-and-snowflake) ### Business productivity · 31 - [Resend and Adobe Sign](https://www.stacksync.com/integrations/adobe-sign-and-resend) - [Resend and Amazon Seller Central](https://www.stacksync.com/integrations/amazon-seller-central-and-resend) - [Resend and Asana](https://www.stacksync.com/integrations/asana-and-resend) - [Resend and Aviato](https://www.stacksync.com/integrations/aviato-and-resend) - [Resend and BetterContact](https://www.stacksync.com/integrations/better-contact-and-resend) - [Resend and Braze](https://www.stacksync.com/integrations/braze-and-resend) - [Resend and ConnectWise](https://www.stacksync.com/integrations/connectwise-and-resend) - [Resend and Customer.io](https://www.stacksync.com/integrations/customer-io-and-resend) - [Resend and Docusign](https://www.stacksync.com/integrations/docusign-and-resend) - [Resend and FullEnrich](https://www.stacksync.com/integrations/full-enrich-and-resend) - [Resend and Gainsight](https://www.stacksync.com/integrations/gainsight-and-resend) - [Resend and GitHub](https://www.stacksync.com/integrations/github-and-resend) - [Resend and Google Sheets](https://www.stacksync.com/integrations/google-sheets-and-resend) - [Resend and Ironclad](https://www.stacksync.com/integrations/ironclad-and-resend) - [Resend and Klaviyo](https://www.stacksync.com/integrations/klaviyo-and-resend) - [Resend and Lemlist](https://www.stacksync.com/integrations/lemlist-and-resend) - [Resend and Lusha](https://www.stacksync.com/integrations/lusha-and-resend) - [Resend and Microsoft 365](https://www.stacksync.com/integrations/microsoft-365-and-resend) - [Resend and Microsoft Dynamics 365](https://www.stacksync.com/integrations/microsoft-dynamics-365-and-resend) - [Resend and Microsoft Teams](https://www.stacksync.com/integrations/microsoft-teams-and-resend) - [Resend and Monday](https://www.stacksync.com/integrations/monday-and-resend) - [Resend and Notion](https://www.stacksync.com/integrations/notion-and-resend) - [Resend and Quip](https://www.stacksync.com/integrations/quip-and-resend) - [Resend and SendGrid](https://www.stacksync.com/integrations/resend-and-sendgrid) - [Resend and ServiceMax](https://www.stacksync.com/integrations/resend-and-servicemax) - [Resend and Slack](https://www.stacksync.com/integrations/resend-and-slack) - [Resend and Smartsheet](https://www.stacksync.com/integrations/resend-and-smartsheet) - [Resend and SysAid](https://www.stacksync.com/integrations/resend-and-sysaid) - [Resend and Twilio](https://www.stacksync.com/integrations/resend-and-twilio) - [Resend and Wrike](https://www.stacksync.com/integrations/resend-and-wrike) - [Resend and Zendesk](https://www.stacksync.com/integrations/resend-and-zendesk) ### Accounting and finance · 13 - [Resend and Adyen](https://www.stacksync.com/integrations/adyen-and-resend) - [Resend and BILL](https://www.stacksync.com/integrations/bill-and-resend) - [Resend and Braintree](https://www.stacksync.com/integrations/braintree-and-resend) - [Resend and Coupa](https://www.stacksync.com/integrations/coupa-and-resend) - [Resend and Hyperline](https://www.stacksync.com/integrations/hyperline-and-resend) - [Resend and Navan](https://www.stacksync.com/integrations/navan-and-resend) - [Resend and QuickBooks](https://www.stacksync.com/integrations/quickbooks-and-resend) - [Resend and Ramp](https://www.stacksync.com/integrations/ramp-and-resend) - [Resend and Recurly](https://www.stacksync.com/integrations/recurly-and-resend) - [Resend and Rillet](https://www.stacksync.com/integrations/resend-and-rillet) - [Resend and Stripe](https://www.stacksync.com/integrations/resend-and-stripe) - [Resend and Workday](https://www.stacksync.com/integrations/resend-and-workday) - [Resend and Zuora](https://www.stacksync.com/integrations/resend-and-zuora) ### AI · 4 - [Resend and Autopilot](https://www.stacksync.com/integrations/autopilot-and-resend) - [Resend and Azure OpenAI](https://www.stacksync.com/integrations/azure-openai-and-resend) - [Resend and OpenAI](https://www.stacksync.com/integrations/openai-and-resend) - [Resend and Pinecone](https://www.stacksync.com/integrations/pinecone-and-resend) ### Communications · 1 - [Resend and Gmail](https://www.stacksync.com/integrations/gmail-and-resend) ### Developer tools · 9 - [Resend and Azure Service Bus](https://www.stacksync.com/integrations/azure-service-bus-and-resend) - [Resend and Datadog](https://www.stacksync.com/integrations/datadog-and-resend) - [Resend and Jira](https://www.stacksync.com/integrations/jira-and-resend) - [Resend and JMS](https://www.stacksync.com/integrations/jms-and-resend) - [Resend and LDAP](https://www.stacksync.com/integrations/ldap-and-resend) - [Resend and New Relic](https://www.stacksync.com/integrations/newrelic-and-resend) - [Resend and Opsgenie](https://www.stacksync.com/integrations/opsgenie-and-resend) - [Resend and PagerDuty](https://www.stacksync.com/integrations/pagerduty-and-resend) - [Resend and RabbitMQ](https://www.stacksync.com/integrations/rabbitmq-and-resend) ### Human resources · 11 - [Resend and Ceridian Dayforce](https://www.stacksync.com/integrations/ceridian-dayforce-and-resend) - [Resend and Greenhouse](https://www.stacksync.com/integrations/greenhouse-and-resend) - [Resend and Hibob](https://www.stacksync.com/integrations/hibob-and-resend) - [Resend and Jobvite](https://www.stacksync.com/integrations/jobvite-and-resend) - [Resend and Lever](https://www.stacksync.com/integrations/lever-and-resend) - [Resend and Oracle Fusion Cloud HCM](https://www.stacksync.com/integrations/oracle-fusion-cloud-hcm-and-resend) - [Resend and Paylocity](https://www.stacksync.com/integrations/paylocity-and-resend) - [Resend and SmartRecruiters](https://www.stacksync.com/integrations/resend-and-smartrecruiters) - [Resend and Success Factors](https://www.stacksync.com/integrations/resend-and-success-factors) - [Resend and UKG Pro](https://www.stacksync.com/integrations/resend-and-ukg-pro) - [Resend and UKG Ready](https://www.stacksync.com/integrations/resend-and-ukg-ready) ### Security and identity · 6 - [Resend and Active Directory](https://www.stacksync.com/integrations/active-directory-and-resend) - [Resend and Auth0](https://www.stacksync.com/integrations/auth0-and-resend) - [Resend and Azure Active Directory](https://www.stacksync.com/integrations/azure-active-directory-and-resend) - [Resend and JumpCloud](https://www.stacksync.com/integrations/jumpcloud-and-resend) - [Resend and Okta](https://www.stacksync.com/integrations/okta-and-resend) - [Resend and OneLogin](https://www.stacksync.com/integrations/onelogin-and-resend) ### Storage · 4 - [Resend and Amazon S3](https://www.stacksync.com/integrations/amazon-s3-and-resend) - [Resend and Box](https://www.stacksync.com/integrations/box-and-resend) - [Resend and Egnyte](https://www.stacksync.com/integrations/egnyte-and-resend) - [Resend and SharePoint](https://www.stacksync.com/integrations/resend-and-sharepoint) SECURITY ## Security teams trust Stacksync As a data company, we understand the importance of keeping your data secure. Stacksync is built with security best practices to keep your data safe at every layer, and is DPF-certified for US, EU, UK and CH data transfers. [Learn more about security](https://www.stacksync.com/security) | | | | --- | --- | | | SOC 2 Type II | | | ISO 27001 | | | HIPAA BAA | | | GDPR | | | CCPA | | | DPF US-EU-UK-CH | → SECURITY WITH BENEFITS ### SSO & SCIM Let your users access Stacksync from your centralized user management systems. Works with Okta, Azure, Google SSO and more. ### Alerts Immediately get alerted about record syncing issues over email, Slack, PagerDuty and WhatsApp. Resolve issues from a centralized dashboard with retry and revert options. ### Secure connection options Securely connects to your systems with: [OAuth 2](https://www.stacksync.com/security) [SSH Tunnelling](https://docs.stacksync.com/two-way-sync/connectors/setup-options/ssh-tunneling) [SSL certificates](https://docs.stacksync.com/two-way-sync/connectors/postgres/authorize-postgres/amazon-rds/ensuring-secure-rds-connections-with-ssl-certificate) [IP Whitelisting](https://docs.stacksync.com/two-way-sync/connectors/setup-options/ip-whitelisting) [VPN gateway](https://docs.stacksync.com/two-way-sync/legal/service-consumption-tables#:~:text=%E2%9C%93-,VPN%20gateway,-%2D) [VPC peering](https://www.stacksync.com/security) and more ## Connect the systems your business runs on. Build your next workflow with Stacksync. 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