Linkcheck via Postfix-users:
> Haven't seen this one before...
>
> Jun 5 10:02:22 bristolmail postfix/smtp[300641]: CF3B73F87F:
> to=<[email protected]>,
> relay=mx-01-eu-west-1.prod.hydra.sophos.com[63.33.39.203]:25, delay=10,
> delays=5.1/2.9/2.1/0.22, dsn=5.7.4, status=bounced (host
> mx-01-eu-west-1.prod.hydra.sophos.com[63.33.39.203] said: 550 5.7.4
> XGEMAIL_0006 Command rejected : The rejection of the message occurred
> due to a mismatch in TLS versions between the configured TLS version is
> Preferred TLS 1.3 for the recipient: [email protected] and the
> sender: schoolhistoryscene.co.uk TLS version is not available (in reply
> to RCPT TO command))
>
> I have SMTP TLS turned off to reduce attacks on the server but I wonder
> - should I enable, in main.cf (or master.cf smtp: ?):
>
> smtp_tls_security_level = may
You can always enable Postfix SMTP client TLS with the above setting.
NO CLIENT CERTIFICATE needed.
Wietse
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