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cannot connect to any smtp server via mail client from within my network

Posted on 2007-04-04
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Last Modified: 2012-05-05
Greetings,

Strangely i am unable to connect to any smtp server from inside my network.  This is occuring since yesterday.

It is very strange, I have tested with three different smtp servers, including our isp which is comcast.  I am able to ping smtp.comcast.net.

I have tried in outlook, oe and thunderbird, I get unable to connect to outgoing mail server error messages, however i can connect to the mail servers via web mail so I know they are functioning properly for both outgoing and incoming messages.

It is like something on my network is blocking the smtp connection in general.  I have restarted my router and comcast modem.

This is a strange one for me.

Thanks for any ideas.

Sky
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Question by:skykuhl
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war1 earned 500 total points
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skykuhl,

1. Register an important send/receive library file.  Go to Start > Run and type regsvr32 inetcomm.dll

2. Check if antivirus email check is slowing sending and receiving.  Disable it. Check if other programs running in the background is interfering. Disable one at a time the Firewall, antispyware, antispam, and all Norton programs.

3. In the account settings, Advanced settings, change the server timeout time from 1 min to 5 min

4. Check if outgoing mail server authentication is required. Select that option in account settings and use same settings as incoming server

5. Your ISP may be blocking port 25. Try using alternate port 587.

If no joy, you need to use your ISP SMTP server to send out emails.

6. Create a new Outlook profile.
http://www.outlook-tips.net/howto/profile.htm

7.  Check with email provider Tech Support to determine if server is having trouble.
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by:skykuhl
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The thing is it is not only in one client.  It is the whole network, even a laptop that is not on our domain.

My isp is comcast and usually you can just use smtp.comcast.net,  I have also used our normal settings for our mail server which is hosted outside the network and also my own mail server which I use for testing, so three different and unrelated smtp servers.  It is strange.

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by:skykuhl
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I think this is more of a networking issue.
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by:skykuhl
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It turns out that comcast actually had blocked our ability to send outgoing mail.

I don't know why yet but I have to e-mail some address to plead our case.

Trying on port 587 was useful though it didn't make a difference, on that port the send failed due to an authentication error.

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