On 26 Sep 2020, at 07:45, Alec Moskvin alecm@gmx.com wrote:
250-AUTH PLAIN LOGIN 250 AUTH=PLAIN LOGIN
I believe this is not really an issue. The warning is just that, a warning. Some (broken) mail clients, Immagonnaguess Microsoft ones, expected the =, so many mail servers provide it.
AFAIK, It is safe to ignore the warning.
Ah, yes, I think this is it? (At least for Postfix)
http://www.postfix.org/SASL_README.html
broken_sasl_auth_clients (default: no) Enable interoperability with remote SMTP clients that implement an obsolete version of the AUTH command (RFC 4954). Examples of such clients are MicroSoft Outlook Express version 4 and MicroSoft Exchange version 5.0.
Specify "broken_sasl_auth_clients = yes" to have Postfix advertise AUTH support in a non-standard way.
It is probably safe for anyone to disable that, however, as I don't think those old versions support modern TLS.
-- showing snuffy is when Sesame Street jumped the shark