I'm using Postfix. When I try to send an email to a local domain, I receive the following error:
Host or domain name not found. Name service error for name=example.com
type=AAAA: Host found but no data record of requested type.
Why is this happening and what can I do to fix it?
Your server is trying to use IPv6 when sending the mail. Since the mail.example.com doesn't have an AAAA-record (which is the same as an A-record, but for IPv6), it isn't working.
If you want Postfix to never use IPv6, you can change that in the config file, as explained in the Postfix postconf manual page:
When IPv6 support is enabled via the inet_protocols parameter, Post- fix will do DNS type AAAA record lookups.
When both IPv4 and IPv6 support are enabled, the Postfix SMTP client will attempt to connect via IPv6 before attempting to use IPv4.
Examples:
inet_protocols = ipv4
inet_protocols = all (DEFAULT)
inet_protocols = ipv6
inet_protocols = ipv4, ipv6
If you want to change it for this domain only, change your transport map to read example.com smtp-ipv4:[mail.domain.com].
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