Gordon Messmer wrote:
Hongwei Li wrote:
Recently, users say that they cannot use Outlook to send emails out if
they
set SSL connection with port 587 for outgoing server and 993 for incoming
server.
Port 587 isn't an "SSL" port. It's the MSA port, and probably supports
TLS. If Outlook is configured to do SSL rather than TLS, it's not going
to work.
Port 465 is the SMTP "SSL" port.
In my experience Outlook is much happier doing submission using port 465
rather than 587.
I turn on port 465 as follows in sendmail.mc:
DAEMON_OPTIONS(`Port=smtps, Name=TLSMTA, M=s')dnl
Then configure the Outlook clients to use port 465 instead of 587.
Paul.
