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Knowledgebase: Atomic Software
How do I know if port 25 is blocked?
Posted by Alex Kratko on 30 September 2011 06:37 AM
You can do a quick test to check its status. Try to “telnet” port 25 on the smtp server.
on windows - select “start -> run” type in cmd and select run. ( dos type window appears )
type in “telnet smtp.com 25″(without quotation marks) and press enter
you should receive a prompt like “220 ” ( the 220 is important )
If you won't receive 220 then most likely port 25 is blocked either on your end or by your ISP.
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