Emails sent to Gmail, Yahoo, and other providers may bounce if SPF, DKIM, and DMARC are not configured for your sending domain.
Problem description
Starting February 2024, Gmail and Yahoo require senders to configure SPF, DKIM, and DMARC. Emails sent to domains such as gmail.com, googlemail.com, yahoo.com, and aol.com without these configurations may bounce or be marked as spam. Configure all three protocols for your sending domain. For help, contact the Alibaba Mail support team.
For details about Gmail sender requirements, see Email Sender Guidelines.
Solution
DNS query tool: Alibaba Cloud DNS
For example, for `example.net`:
SPF query: `example.net`
DKIM query: `default._domainkey.example.net`
DMARC query: `_dmarc.example.net`
Configure these protocols in your domain's DNS settings. For detailed steps, see the documentation for each protocol.
If you have multiple SPF records, merge them into a single record.
When you configure a DMARC record, set up a dedicated mailbox to receive reports from email providers. You may receive a large volume of reports.
SPF
Sender Policy Framework (SPF) is an email authentication method that combats spam. Receiving mail servers check the domain's SPF record to verify whether the sender's IP address is authorized. Authorized addresses are accepted; unauthorized addresses are rejected as forgeries.
To add an SPF record, see Bounce message: spf check failed.
DKIM
DomainKeys Identified Mail (DKIM) is an email authentication method that detects forged and tampered emails. Senders attach a digital signature to prove the email originated from the claimed domain and was not altered in transit.
To add a DKIM record, see What is DKIM and how do I add it?
DMARC
Domain-based Message Authentication, Reporting, and Conformance (DMARC) is an email authentication protocol that prevents domain spoofing and provides reports on spoofing attempts.
To set up a DMARC record, see What is DMARC and how do I set it up?