[pfx] Re: rejection of message due to mismatch in TLS versions

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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