Custom SMTP Integration

Connect any email provider that supports SMTP/IMAP. Perfect for custom domains, hosted email, or providers without native integration.

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Key Benefits

What you can do with the Custom SMTP integration.

  • Connect any email provider with SMTP
  • Use custom domain email addresses
  • Works with hosted email services
  • Full control over SMTP configuration
  • Support for TLS/SSL encryption
  • IMAP support for reply detection

How to Connect

Set up the Custom SMTP integration in minutes.

1

Step 1

Get SMTP settings from your email provider

2

Step 2

Click "Connect Inbox" → "Custom SMTP"

3

Step 3

Enter SMTP host, port, username, password

4

Step 4

Configure IMAP settings for reply detection

5

Step 5

Test connection and verify sending works

Common Use Cases

How teams use the Custom SMTP integration.

  • Connect custom domain email (info@company.com)
  • Use specialized email providers
  • Connect hosted email services
  • Self-hosted email servers

Common Workflows

Typical workflows with Custom SMTP.

1

Workflow 1

Set up custom branded domains

2

Workflow 2

Connect multiple SMTP accounts

3

Workflow 3

Configure appropriate send limits based on provider

4

Workflow 4

Monitor deliverability across different providers

Requirements

What you need to connect Custom SMTP.

  • SMTP server credentials (host, port, username, password)
  • IMAP access for reply detection (optional but recommended)
  • SPF and DKIM records configured on your domain
  • TLS/SSL support on the SMTP server

Limitations & Considerations

Important information about the Custom SMTP integration.

  • Send limits vary by provider
  • Reply detection requires IMAP access
  • Deliverability depends on domain reputation
  • Some providers may block automation

Custom SMTP Integration FAQs

Any provider with SMTP/IMAP support: FastMail, ProtonMail (Bridge), Zoho Mail, custom hosted email, and more.
Yes, proper SPF, DKIM, and DMARC records on your domain are essential for deliverability when using custom SMTP.
Yes, connect as many SMTP accounts as your plan allows and enable rotation for better deliverability.
You can still send, but automatic reply detection won't work. You'll need to manually check for replies.
SMTP is very reliable when configured correctly. Native integrations offer better reply detection and auth handling.

Ready to Connect Custom SMTP?

Start your 14-day free trial and connect Custom SMTP today.

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