dear sir:
The current email flow is:
Internal sender → PMG → Exchange 2010 → Other anti-spam gateway → External recipient
When using telnet on PMG to connect to Exchange (port 25), emails can be sent out normally.
However, when a client uses telnet to connect to PMG (port 26), the following error occurs:
relay=none, delay=60, delays=0.05/0/60/0, dsn=4.4.1, status=deferred (connect to mx-tw.mail.gm0.yahoodns.net[106.10.248.74]:25: Connection timed out)
Why is the email being sent directly through PMG instead of following the expected flow: PMG → Exchange 2010 → Spam Gateway?
The current email flow is:
Internal sender → PMG → Exchange 2010 → Other anti-spam gateway → External recipient
When using telnet on PMG to connect to Exchange (port 25), emails can be sent out normally.
However, when a client uses telnet to connect to PMG (port 26), the following error occurs:
relay=none, delay=60, delays=0.05/0/60/0, dsn=4.4.1, status=deferred (connect to mx-tw.mail.gm0.yahoodns.net[106.10.248.74]:25: Connection timed out)
Why is the email being sent directly through PMG instead of following the expected flow: PMG → Exchange 2010 → Spam Gateway?