> On 21 Feb 2025, at 03:52, Wayne Spivak <wspi...@sbanetweb.com> wrote: > > Feb 20 14:50:22 NAS smtpd[4965]: d4c46b28c2848cb0 mta connected > Feb 20 14:50:22 NAS smtpd[4965]: d4c46b28c2848cb0 mta error reason=IO Error: > error:0A00010B:SSL routines::wrong version number > Feb 20 14:50:22 NAS smtpd[4965]: smtp-out: Disabling route [] <-> > 96.224.250.24 (mcq.sbanetweb.com) for 15s
When sending to port 587, you should not use the "smtps://" proto, use "smtp+tls://" or "smtp://" instead. In smtpd.conf, "smtps://" means implicit TLS, which usually works on port 465, while "smtp+tls://" and "smtp://" support explicit TLS (i.e. STARTTLS), which usually works on port 25 or 587. Your Postfix server on mcq probably expects plain text or STARTTLS input on port 587.
