> On Mar 26, 2020, at 4:31 PM, Michael Knill > <michael.kn...@ipcsolutions.com.au> wrote: > > Hi Group > > I have a site that I cannot send mail from yet it is configured exactly the > same, with the same Astlinux version as many others that are working to the > same mail server (Office 365). > I get ‘msmtp: the server does not support TLS via the STARTTLS command msmtp: > could not send mail (account default from /etc/msmtprc)‘ > > Now it is sitting behind a firewall with a bit of intelligence (or not) so > I'm wondering if it is blocking something related to the TLS setup. > > Any ideas?
I suppose an SMTP ALG in the firewall could be causing issues. Recall that encrypted mail can be sent via STARTTLS or TLS/SSL. TLS/SSL (typically port 465) is fully encrypted before any data is exchanged. STARTTLS starts out using plain text until STARTTLS is negotiated and switched to an encrypted connection. A SMTP ALG could make the STARTTLS not operate properly since it starts out as plain text. If you can, use TLS/SSL so the connection is fully encrypted. Lonnie _______________________________________________ Astlinux-users mailing list Astlinux-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/astlinux-users Donations to support AstLinux are graciously accepted via PayPal to pay...@krisk.org.
