Real-time
Two-way sync
Changes in Gmail or SendGrid instantly reflect in both systems. No stale data, no manual imports.
Communications ⇄ Business productivity
Gmail to SendGrid integration — real-time, two-way sync
Keep Gmail and SendGrid in sync without custom scripts. Cut weeks of integration work, eliminate silent data drift, and give your team a single, reliable source of truth.
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Adopted by fast-scaling companies moving mission-critical data in real time
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Why teams connect Gmail and SendGrid
Sync the people, users, and work records in SendGrid with the calls, messages, and events in Gmail, in real time and in both directions.
SendGrid holds the records a team works from: the contacts, the tickets or tasks, the users, and the history attached to each. Gmail moves the actual communication, whether that is a call, a text, an email, or a meeting, and every one of those is tied to a person and often to a user on your side. When the two are connected only by manual entry or a nightly export, the communication happens in one system while the record it belongs to sits in another, so people rebuild context by hand and reach out from contact lists that are already out of date.
Stacksync syncs Categories, Senders, Single Sends, Unsubscribe Groups in SendGrid with Drafts, Attachments, History, Messages in Gmail bi-directionally and in real time. Contacts and users maintained in SendGrid feed Gmail so outbound dialing, messaging, and invites reach current numbers and addresses, and the calls, messages, and meeting events Gmail produces attach to the matching record in SendGrid within seconds. Everything is mapped field by field, with conflict resolution in place of copy-paste, and there is no middleware to build, no rate limits to babysit, and no batch job that leaves the morning running on yesterday's data.
Because the sync is field-level, each system keeps its own extras; only the shared people, users, and activity are held in agreement.
Common use cases
- 01 Keep product-usage attributes from an operational database updated on SendGrid contacts to drive lifecycle segments
- 02 Reconcile transactional email activity with support tickets so agents see what a customer was sent
- 03 Mirror Labels with pipeline or ticket states so triage done in an external tool is reflected inside the inbox.
- 04 Log sent and received Messages onto CRM contact and deal timelines automatically so reps never copy-paste email history.
Common sync patterns
One contact master
A person's number, email, or contact preferences corrected in either system update the other, so the record and the channel that reaches them stay in agreement.
Where Gmail places calls or sends messages: activity on the record
Calls, texts, emails, or meeting events from Gmail attach to the matching contact, ticket, or item in SendGrid, so the full history lives with the record instead of in a separate log.
Contacts and numbers kept current for outreach
People and their phone numbers or email addresses maintained in SendGrid sync into Gmail, so outbound dialing, messaging, and invites always reach current details rather than a stale list.
What you can sync between Gmail and SendGrid
Representative objects on each side — any object or custom field can map to any target. Schemas are auto-detected; types are converted between the two systems.
| Gmail objects | SendGrid objects | How this pairing syncs | |
|---|---|---|---|
| History The incremental change log keyed by historyId; used for efficient delta sync so only mailbox changes since the last cursor are fetched. | Contacts Marketing recipients upserted from CRM or database records, including custom field values. | History is specific to Gmail and Contacts to SendGrid — each maps to any object or custom field on the other side. | |
| Messages Individual emails with headers, body, and label state; read out to a CRM or warehouse for activity logging, and sent or modified two-way from sales tools. | List Synced with incremental and full sync per the Stacksync docs. | Messages is specific to Gmail and List to SendGrid — each maps to any object or custom field on the other side. | |
| Threads Conversation groupings that keep replies together; synced so a CRM timeline or support desk shows the full exchange, not isolated messages. | Segments Query-based contact groups whose membership SendGrid computes from contact fields. | Threads is specific to Gmail and Segments to SendGrid — each maps to any object or custom field on the other side. | |
| Labels User and system labels (INBOX, SENT, custom); applied and removed via sync to mirror pipeline stages or triage states from an external system. | Categories Synced with incremental and full sync per the Stacksync docs. | Labels is specific to Gmail and Categories to SendGrid — each maps to any object or custom field on the other side. | |
| Drafts Unsent messages; created and updated from templates or sequence tools so reps review before sending from their own mailbox. | Senders Synced with incremental and full sync per the Stacksync docs. | Drafts is specific to Gmail and Senders to SendGrid — each maps to any object or custom field on the other side. | |
| Attachments File payloads referenced by message part; read out to storage or a document system for archival and compliance workflows. | Single Sends One-off marketing campaigns whose stats are read back for reporting. | Attachments is specific to Gmail and Single Sends to SendGrid — each maps to any object or custom field on the other side. |
How changes propagate between Gmail and SendGrid
Each direction of the sync is driven by what the source system can signal and what the destination accepts — detection, delivery, and expected latency below.
Gmail SendGrid Sub-second propagation
DetectionGmail notifies Stacksync of record changes through webhook events. Incremental sync via users.history.list from a stored historyId cursor, plus real-time push notifications through Google Cloud Pub/Sub watch on the.
DeliveryEach detected change is written to SendGrid through its API, with automatic retries and rate-limit backoff.
SendGrid Gmail Sub-second propagation
DetectionSendGrid notifies Stacksync of record changes through webhook events. Event Webhook posts delivery and engagement events (processed, delivered, open, click, bounce, spam report) to an HTTP endpoint.
DeliveryEach detected change is written to Gmail through its API, with automatic retries and rate-limit backoff.
Rate-limit considerations
- Gmail: Quota is measured in units per user per second (e.g. messages.list = 5 units, messages.send = 100 units) against a 250 quota-unit/user/second limit and a daily project cap; exceeding limits returns 429 with exponential backoff expected.
- SendGrid: Subject to the platform's API rate limits; contact upserts are batched, asynchronous jobs rather than per-row writes.
What ships with Gmail ⇄ SendGrid
Connect Gmail and SendGrid for flexible, real-time data sync.
Real-time sync, workflow automation, event queues, EDI, and monitoring, for every Gmail–SendGrid connection.
No-code + pro-code
Workflow automation
Trigger automated workflows whenever Gmail or SendGrid data changes, update records, fire webhooks, or kick off sequences without brittle API scripts.
At scale
Event queues
Handle millions of events per minute without losing a single Gmail or SendGrid record.
Observability
Monitoring
Track your Gmail ⇄ SendGrid sync health, view errors, and replay failed events in one click.
Trading partners
EDI
Transform legacy EDI complexity into simple database interactions between Gmail and SendGrid.
How the Gmail and SendGrid connectors work
Gmail
- Integration surface
- Gmail API (REST, v1)
- Authentication
- OAuth 2.0 via Google — user-authorized consent with granular scopes (gmail.readonly, gmail.modify, gmail.send, gmail.labels); restricted scopes require Google's app verification for production use
- Change detection
- Incremental sync via users.history.list from a stored historyId cursor, plus real-time push notifications through Google Cloud Pub/Sub watch on the mailbox (watch must be renewed at least every 7 days)
- Capabilities
- read · write · webhooks
- Rate limits
- Quota is measured in units per user per second (e.g. messages.list = 5 units, messages.send = 100 units) against a 250 quota-unit/user/second limit and a daily project cap; exceeding limits returns 429 with exponential backoff expected.
SendGrid
- Integration surface
- REST API (v3)
- Authentication
- API key (create in SendGrid Settings > API Keys with Custom Access / Full Access for the objects to sync; key begins with "SG")
- Change detection
- Event Webhook posts delivery and engagement events (processed, delivered, open, click, bounce, spam report) to an HTTP endpoint; contact and list changes are detected by polling
- Capabilities
- read · write · webhooks
- Rate limits
- Subject to the platform's API rate limits; contact upserts are batched, asynchronous jobs rather than per-row writes
How it works
How to connect Gmail to SendGrid — three steps, no code
Configure and sync within minutes, no code. Whether you sync 50k or 100M+ records, Stacksync handles the queues, infra, and plumbing. Integrations are non-invasive and need zero setup on your systems.
- 01
Connect your apps
Authenticate Gmail and SendGrid with each platform's native method — OAuth, API keys, or service accounts — plus secure options like SSH tunneling, IP whitelisting, and VPC peering.
Gmail
connected
SendGrid
connected
OAuth 2.0SSH tunnelSSL certificateVPC peering - 02
Choose tables
Pick the Gmail and SendGrid objects to sync — Stacksync auto-detects both schemas, including custom fields where the platform exposes them. Sync to existing tables, or let Stacksync create new ones with ideal data types.
objects · Gmail ⇄ SendGridCustomers 12,480Sales Orders 8,213Invoices 5,902Items 1,344 - 03
Map fields
Fields map automatically even when names and types differ. Stacksync handles transformation and type casting for you, zero configuration required.
Gmail SendGridCompany company_name textEmail email textAmount amount numericCreated created_at timestamp
FAQ
Gmail and SendGrid integration FAQ
-
Yes. Stacksync provides a managed, real-time two-way integration between Gmail and SendGrid: authenticate both systems, choose the objects to sync (such as Gmail's History and Messages), map fields visually, and changes propagate both ways in milliseconds — no code required.
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Stacksync is SOC 2 Type II and ISO 27001 certified with HIPAA BAA support. Data is encrypted in transit, and a zero-persistent-storage architecture means Gmail and SendGrid records are not retained after a sync operation.
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Stacksync pricing is usage-based and starts at $1,000/month, including the managed Gmail and SendGrid connectors, real-time two-way sync, monitoring, and support. That replaces building and maintaining a custom Gmail–SendGrid integration in-house.
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Yes — Stacksync ships production-grade connectors for both Gmail and SendGrid. The connectors handle authentication, schema detection, rate limits, and retries; you configure the sync, and Stacksync operates it.
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Change detection on Gmail: Incremental sync via users.history.list from a stored historyId cursor, plus real-time push notifications through Google Cloud Pub/Sub watch on the mailbox (watch must be renewed at least every 7 days). On SendGrid: Event Webhook posts delivery and engagement events (processed, delivered, open, click, bounce, spam report) to an HTTP endpoint; contact and list changes are detected by polling. Each detected change propagates to the other side in milliseconds, with field-level conflict resolution and an inspectable event log.
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On the SendGrid side: Categories, Senders, Single Sends, Unsubscribe Groups, plus custom fields where SendGrid exposes them. On the Gmail side: Drafts, Attachments, History, Messages. Stacksync auto-detects both schemas and converts types between the two systems.
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.
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:
Related integrations
Every pair below is a real-time, two-way sync. Search all 306 integrations available for Gmail and SendGrid.
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