Re: Mail authentication error?

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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.


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