Question

Locked

port 25 blocked

By johnson_kjohn ·
Dear all,

We are running on Exchange 2000 server.We have around 50 POP3 users.The problem is, some of the ISP has blocked the port 25 instead they have opened the port 587, our POP3 users are not able to send the mails.

1. How to resolve the issue ?
2. As an administrator, whether i have to do some configuration changes on our exchange 2000 server.

Regards,
Johnson

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All Answers

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Don't be silly!

by ComputerCookie In reply to port 25 blocked

Or perhaps you have been, how could the ISP block port 25 on your sever?

Have you checked your firewall settings?
Have you checked your router?

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ISP block port 25

by johnson_kjohn In reply to Don't be silly!

Thanks for the reply.

Nobody has blocked port 25 on our server.
What i mean is that,when the pOP3 uers is trying to send the mail from other ISP's, in that ISP's firewall, they have blocked the port 25 instead they have oped port 587.So our users could not able to send mail using port 25.

Regards,
Johnson

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Change the pop port to 587 in Outlook

by Dumphrey In reply to ISP block port 25

and make sure your exchange server is listening for pop on 537, OR your firewall is translating 537 external to 110 internal. Port 25 has nothing to do with POP protocol, 25 is smtp. Basically they are trying to slow down open relay mail servers...

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Reset your gear...

by boxfiddler Moderator In reply to port 25 blocked

to use port 587 for your POP3 users. And reset the POP3 accounts to use port 587 in place of port 25.

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ISP block port 25

by johnson_kjohn In reply to Reset your gear...

Thanks for the reply.

So i have to change the port in the client machine.

I have one more query like, if i am not opeing the port 587 in the exchange 2000 server, how the POP3 user will connect to my server after only changing the port in pop3 accounts(SMTP).

Regards,
Johnson

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Let me get this straight...

by boxfiddler Moderator In reply to ISP block port 25

(and for others who are likely better able to help over the long haul).

Your POP3 users access your Exchange Server, via POP3?

Why not set them up with RPC over HTTPS rather than POP3? This is what my employer does to allow us to access our email accounts from our home machines, as many of us work from home.

http://support.microsoft.com/kb/833401

etu

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POP3 issue

by johnson_kjohn In reply to Let me get this straight. ...

Thanks for the support.

As i said we are running on Exchange 2000 server. This product is not supporting RPC over Http.

regards,
Johnson

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Sorry, missed that...

by boxfiddler Moderator In reply to POP3 issue

Why can you not move these users to Exchange rather than POP3, then?

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Interesting article here

by Jacky Howe In reply to port 25 blocked

http://wiki.ctyme.com/index.php/How_to_put_an_end_to_Virus_Infected_Spam_Bots

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Sounds more like a homework question!

by ComputerCookie In reply to Interesting article here

Still don't understand what he's on about though!!!

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