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2020 Oct 15
0
how to set smtp-client -> submission_relay_host for IPv4 only?
...if they see an AAAA record.
If you don't need IPV6 for your host remove the AAAA record. All
connections will then only use IPV4.
If you need IPV6 for some other reason then create an alias DNS A record
and point your clients to that instead
e.g.
myhost? A 192.0.2.1
AAAA 2001:db8::1
myhostv4 A 192.0.2.1
you will have to change your certificate to include the alias myhost4
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2020 Oct 15
2
how to set smtp-client -> submission_relay_host for IPv4 only?
In dovecot conf, for submission relay, I've config'd
submission_relay_host = lan.example.com
submission_relay_port = 465
hostname -- not IP -- must be used, to inform relay for cert verification match.
Here,
host lan.example.com
lan.example.com has address 10.0.1.47
lan.example.com has IPv6 address fd80:25:01::47
The receiving smtp relay listens only on IPv4 -- no