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SMTP PORT 25 BLOCKED: I can receive but can not send email.
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MrGamma



Joined: 07 May 2007
Posts: 3

PostPosted: Mon Oct 01, 2007 5:28 pm    Post subject: Reply with quote

It would seem this blocking is only for people running a mail server behind the ISP's network...

Anyone simply logging in to check their pop3 account would be unaffected... Someone please correct me if I'm wrong as I find it very hard to believe that ISP's would block the default mail port that is set during a new outlook express email account setup...

Rather stupid considering we must all send and receive email... this port 25 block must be for mail server blocking only...

anyone have details about this?
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kevin
CWH Staff


Joined: 13 Dec 2004
Posts: 206
Location: Vancouver, BC

PostPosted: Fri Nov 30, 2007 2:19 pm    Post subject: Reply with quote

Hi,

This is for everyone including end users, not limited to mail servers.

We have 1-2 questions a day about this issue and it's quickly resolved by changing the email client's smtp port to 26.

You can test and see if they are blocking port 25 by opening a dos window in Windows and typing:

Code:

telnet mail.yourdomain.com 25


Replace yourdomain.com with your actual domain name.

If you see a blank screen then your ISP is blocking that port.

------------------
Kevin
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tony
CWH Staff


Joined: 26 Jan 2005
Posts: 36
Location: Vancouver, BC

PostPosted: Thu Jan 10, 2008 2:57 pm    Post subject: Reply with quote

MrGamma wrote:
It would seem this blocking is only for people running a mail server behind the ISP's network...

Anyone simply logging in to check their pop3 account would be unaffected... Someone please correct me if I'm wrong as I find it very hard to believe that ISP's would block the default mail port that is set during a new outlook express email account setup...

Rather stupid considering we must all send and receive email... this port 25 block must be for mail server blocking only...

anyone have details about this?


It is not blocking a mail server behind your ISP. This is a block to all 3rd party SMTP servers by a customer of the ISP.

They block all outgoing SMTP traffic on port 25 to external servers in an attempt to stop spam. You will only be able to send on port 25 to your ISP's Mail server.
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