Linux Ask!

Linux Ask! is a Q & A web site specific for Linux related questions. Questions are collected, answered and audited by experienced Linux users.

Nov 072010

What is the SMTP submission port 587?


A lot of ISPs will block the port 25 for preventing users from sending spam emails. To send email if you use such ISPs, you need to use port 587.

Port 587 is the official port for sending email on mail submission agents (MSAs), as defined in RFC 2476

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