Automate Slack & Gmail

Stop paying for mismatched spreadsheets. Sync data between Slack and Gmail in real-time, so you can manage your operations without the busywork.

Get This Workflow Built

Custom API Integration

Secure Data Transfer

Done-For-You Setup

How the Data Flows

graph LR
    subgraph Source ["Slack"]
        T1(["Fetch Custom Actions"])
    end
    
    subgraph Middleware ["Enterprise Integration Core"]
        W[Webhook
Listener] --> V{Validation
& Auth}
        V -->|Fail| DLQ[Dead Letter
Queue]
        V -->|Pass| Map[Data Mapping
& Transformation]
        Map --> Retry[Rate Limiting
& Retries]
    end
    
    subgraph Target ["Gmail"]
        A1(["Add Label to Email"])
    end

    T1 -->|JSON Payload| W
    Retry -->|Authenticated API POST| A1

    style Source fill:transparent,stroke:#cbd5e1,stroke-dasharray: 5 5
    style Target fill:transparent,stroke:#cbd5e1,stroke-dasharray: 5 5
    style Middleware fill:#f8fafc,stroke:#94a3b8,stroke-width:2px
    style T1 fill:#3b82f6,stroke:#fff,stroke-width:2px,color:#fff
    style W fill:#1f2937,stroke:#fff,stroke-width:1px,color:#fff
    style V fill:#1f2937,stroke:#fff,stroke-width:1px,color:#fff
    style Map fill:#1f2937,stroke:#fff,stroke-width:1px,color:#fff
    style Retry fill:#1f2937,stroke:#fff,stroke-width:1px,color:#fff
    style DLQ fill:#ef4444,stroke:#fff,stroke-width:1px,color:#fff
    style A1 fill:#e11d48,stroke:#fff,stroke-width:2px,color:#fff

When Slack and Gmail operate independently, important communication details can fall through the cracks. For instance, a sales team member might receive a customer inquiry in Slack, but if that information isn't transferred to Gmail, the follow-up email could lack critical context. This leads to wasted time as team members manually copy-paste information, risking errors and miscommunication. The sales team spends valuable hours tracking down information that should have been automatically captured.

Top Ways to Automate Slack & Gmail

Automated Email Notifications: Instantly receive Slack notifications for important emails, ensuring that critical communications are never missed and allowing for prompt responses.
Streamlined Task Management: Convert Slack messages into actionable tasks in Gmail, enabling teams to track and manage their workload efficiently without losing context.
Centralized Communication Hub: Sync messages and updates between Slack and Gmail, creating a unified communication platform that enhances collaboration and reduces the risk of information silos.

How to Build the Slack → Gmail Sync

In your Slack workspace, set up a Standard Webhook by navigating to the 'Apps' section and selecting 'Incoming Webhooks'. Choose the channel where notifications will be sent and copy the generated webhook URL.
In your application, create a listener for the Slack webhook. This should capture the payload that includes the message text and user details. The relevant data fields are 'text' for the message content and 'user' for the sender's identity.
Extract the necessary data from the Slack payload. For example, you will need to extract the 'text' field for the email body and the 'user' field to identify the sender.
Use the Gmail REST API to send an email. Construct a POST request to the endpoint https://gmail.googleapis.com/gmail/v1/users/me/messages/send. Ensure that the request body includes the 'raw' field, which contains the Base64 URL encoded email content formatted according to RFC 2822.
Test the integration by sending a message in the designated Slack channel and confirming that an email is generated in the specified Gmail account with the correct content and sender information.

Developer Warnings & API Gotchas

Ensure that the 'user' field from Slack is mapped correctly to the 'From' field in the Gmail API. If the user is not a recognized sender in Gmail, the email may fail to send.
When encoding the email content for the Gmail API, remember to include the necessary headers (e.g., To, Subject) in the Base64 encoded string. Missing headers will result in improperly formatted emails.
Be cautious with the message text length; Slack messages can exceed Gmail's character limits for certain fields, leading to truncated emails if not handled properly.

Supported API Operations

We leverage official, stable endpoints to ensure secure data transfer. No deprecated legacy routes.

When this happens in Slack... Fetch Custom Actions

Do this in Gmail Add Label to Email
When this happens in Slack... List Canvas Sections

Do this in Gmail Archive Email
When this happens in Slack... List Canvases

Do this in Gmail Create Draft
When this happens in Slack... List Channels available for User

Do this in Gmail Create Draft (Legacy)
When this happens in Slack... List Private Channels available for User

Do this in Gmail Create Draft Reply

SyncMatrix Experts

Available for Hire

We are an AI-powered automation team. We build custom, reliable API workflows that eliminate manual data entry.

Speak with an Integration Architect

We build custom API workflows that don't hit rate limits.

I can see you're looking at mapping Slack to Gmail. Tell me about your current setup—what's the specific bottleneck you're trying to automate right now?