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When recipients find your messages in their spam folder, the cause is almost always authentication or the address you send from. Work through these checks.
To rescue incoming mail instead, see Manage spam and blocked senders.
Check the address you send from
Mail sent from an astermail.org or aster.cx address is signed by Aster, so nothing is left for you to set up.
Mail sent from a custom domain is signed with that domain’s own key, and it only passes checks when the domain’s DNS records are in place.
Verify your domain’s records
- Go to Settings > Domains.
- Open the domain, and select View DNS Records.
- Confirm the SPF, DKIM, and DMARC records show Verified. If one shows Not detected, fix it at your registrar and select Verify All Records.
Common causes of a failed check:
- Two SPF records on the domain. Merge them into one that includes Aster.
- A DKIM value that your registrar cut short. Paste the full value.
- A DMARC record entered at the wrong host. Use
_dmarc, not_dmarc.example.com. - Another service still sending as your domain without being listed in SPF.
See SPF, DKIM, and DMARC for your domain and How to add a custom domain.
Confirm the message itself was signed
Ask the recipient to open the message’s details and check the authentication results, or send a test message to an address you control elsewhere and check its headers. SPF, DKIM, and DMARC should all pass.
Ask the recipient to mark it as not spam
One message rescued from spam teaches the receiving provider more than any change you make on your side. Ask the recipient to move your message out of spam and add your address to their contacts.
Reduce what looks like bulk mail
Receiving providers weigh the shape of a message as well as its authentication. Sending the same message to a long recipient list, writing a subject in all capitals, or filling a short message with links and images all make a message look like bulk mail. Write to smaller groups, and keep links to the ones the recipient asked for.
Read the bounce
If a message is rejected rather than filed as spam, you get a bounce message. It names the receiving server’s reason, such as a blocked address or a failed policy check. Send that text with any support request.
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