Overview
Starting in 2024, email senders must meet specific requirements to send email to Gmail personal accounts (@gmail.com or @googlemail.com). These guidelines help ensure the successful delivery of messages and reduce the risk of them being blocked or marked as spam.
Requirements for all senders (any volume)
- Set up SPF or DKIM email authentication for your sending domains
- Ensure sending domains/IPs have valid forward and reverse DNS (PTR) records
- Use a TLS connection for transmitting email
- Keep spam rates reported in Postmaster Tools below 0.3%
- Format messages according to the RFC 5322 standard
Requirements for high-volume senders (5,000+ messages/day)
- Set up SPF and DKIM email authentication
- Set up DMARC email authentication (enforcement policy can be set to "none")
- The domain in the sender's From: header must align with either the SPF domain or the DKIM domain (required to pass DMARC)
- Marketing messages must support one-click unsubscribe and include a clearly visible unsubscribe link in the message body
Infrastructure requirements and guidelines
IP address configuration
- The sending IP address must match the IP address of the hostname specified in the pointer (PTR) record
- Set up valid reverse DNS records pointing to your domain
Shared IP considerations
- The activity of any sender using a shared IP address affects the reputation of all senders for that shared IP address
- Verify the shared IP isn't on any blocklist
- Monitor shared IP reputation through Postmaster Tools
Content guidelines
- Format HTML messages according to HTML standards
- Don't use HTML and CSS to hide content in your messages
- Make web links visible and easy to understand
- Keep sender information clear and visible
Display name best practices
What to do
- Display names should reflect a consistent, clear, and accurate statement of the sender's identity
- Use display names exclusively to identify the sender
- Maintain consistency across messages
What to avoid
- Don't include subject or message content in display names
- Avoid misleading names like "URGENT REQUEST" or "Last Chance"
- Don't include the recipient's name in the display name
- Display names should never be used to deceive the recipient
Subscription management
One-click unsubscribe setup
For high-volume senders, include both headers:
List-Unsubscribe-Post: List-Unsubscribe=One-Click List-Unsubscribe: <https://yourdomain.com/unsubscribe/example>
Default behavior in Blueshift
One-click list unsubscribe is enabled by default in Blueshift unless the list-unsubscribe header is manually disabled for the campaign.
Best practices
- Make it easy for recipients to opt in with confirmed email addresses
- Provide easy unsubscribe options
- Consider unsubscribing recipients who don't engage
- Send only to people who want your messages
Monitoring & compliance
- Regularly check Google Postmaster Tools for current reputation status and delivery errors
- Keep spam rates reported in Postmaster Tools below 0.10% and avoid reaching a spam rate of 0.30% or higher
- Monitor overall compliance status on the Google Sender Compliance page: https://postmaster.google.com/v2/sender_compliance
- Check domain status with Google Safe Browsing regularly
- Use the Google Admin Toolbox to review DNS and fix domain settings
Gmail – email delivery issues
If you are experiencing lower delivery rates due to soft bounces, Gmail may be rejecting messages. Common Gmail error messages include:
421, "4.7.0": Messages are rejected because the sending server’s IP address is not on the allowed list for the recipient’s domain.
550, "5.7.1": Messages are rejected because the sending server’s IP address is on an IP suspended list. This can happen when using a shared IP with poor reputation.
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