Home > Uncategorized > Unable to telnet to port 25 remotely (Windows SMTP)

Unable to telnet to port 25 remotely (Windows SMTP)

Setting up the SMTP & POP3 service on Windows 2003, I noticed that I could telnet localhost 25 on remote desktop, but not telnet port 25 remotely.

This turned out to be a setting in the Windows SMTP service. Just Open IIS, Right click properties on Default SMTP virtual server, then Access, connection and

select “All except list below”. Then I can telnet in, and the email started working 🙂

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