If you've recently started to receive error messages when sending emails to Gmail addresses, it may be due to a lack of SPF or DKIM authentication for your sender's domain.
SPF (Sender Policy Framework) and DKIM (DomainKeys Identified Mail) are methods used to authenticate your emails, ensuring they're not flagged as spam or rejected by the receiving server.
The error messages you might encounter look like the following:
<firstname.lastname@example.org>: host gmail-smtp-in.l.google.com[220.127.116.11] said: 550-5.7.26 This mail is unauthenticated, which poses a security risk to the 550-5.7.26 sender and Gmail users, and has been blocked. The sender must 550-5.7.26 authenticate with at least one of SPF or DKIM. For this message, 550-5.7.26 DKIM checks did not pass and SPF check for [example.com] did not 550-5.7.26 pass with ip: [18.104.22.168]. The sender should visit 550-5.7.26 https://support.google.com/mail/answer/81126#authentication for 550 5.7.26 instructions on setting up authentication.
For domains managed at Gigahost, enabling SPF is a straightforward process:
- Log into the Gigahost Control Center.
- Click on the "Domains" section.
- Select the domain which you're having trouble with.
- Click on the "DNS" tab.
- Scroll down and select "Gigahost SPF protection" from the dropdown menu.
- Save the changes to update your DNS settings.
Note that it may take some time for the changes to take effect everywhere, but after a few hours you should be able to deliver emails to Gmail addresses.
If you encounter any difficulties during this process, please don't hesitate to contact our support team.