SpeedStream 6520 DSL Router - Port forwarding for port 25

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rajeshvijayan

Thread Starter
Joined
Oct 27, 2009
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1
Hi,

I have been using an DSL Siemens speedstream 6520 router at home. I usually carry out some R&D by placing servers behind the router. I access the services on each of the servers from the ouside using port forwarding and it has been working fine for http, ftp, RDP, any user defined ports etc but in the case of port 25 SMTP its not working at all. I have checked the port on the local lan and I am able to telnet to that server but from the outside only on this port 25 I am not able to telnet. But If i were to change the SMTP port number from 25 to any other port like 24 or 26, I am able to telnet from the outide. Is there any way i can make SMTP port 25 to work and access the same from the outside.

Regards
Rajesh
 

JohnWill

Retired Moderator
Joined
Oct 19, 2002
Messages
106,728
Is it possible that port 25 has been blocked by your ISP? This is a pretty common thing for ISP's to do as a SPAM prevention measure.

As you can see, there are quite a few ISP's blocking port 25 on this list.
 
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