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4352 posts

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# 15235 11-Aug-2007 03:09
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I have two PC's that now refuse to send emails.

I can still receive emails, but I cannot send them.

PC1: Windows XP, ZoneAlarm, NOD32, TB2.0.0.6
PC2: Windows Vista Business, Onecare 2.0, TB2.0.0.6


Now Thunderbird has recently updated to 2.0.0.06, however it was working with this version.

I can still send emails via the web based interface.

I can send emails from Windows Mail in Vista, this is the replacement for Outlook express.

I receive mail via POP3, with no secure connection, and send mail via SMTP with no secure connection again.


The only way I have managed to send emails via TB, is to change the SMTP server, to my mail2 server.

Is anyone able to tell me why this is happening, and how I can fix it? Ie, go back to using the mail.***.com server.

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  # 81969 11-Aug-2007 05:28
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Probably your ISP blocks outbound port 25 connections.

Easy way to check, from a command prompt do a few "telnet test.host.com 25" attempts and see if Telnet connects or times out.

You'll probably have to ask your ISP to either remove the restriction that's in place, use their mailsever or setup a VPN to your mailserver and tunnel traffic over that.



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  # 82003 11-Aug-2007 14:06
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Hi Muppet,

This does still not explain why I am still able to send emails from Windows Mail and not TB.

I tried connection via telnet to the mail server, and it did connect.

UPDATE: I can nolonger send emails via the mail2.domain.com server.

UPDATE2: I can nolonger send ANY emails from ANY client

 
 
 
 


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  # 82041 11-Aug-2007 19:23
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Do you have some sort of AntiVirus installed that "checks" outgoing mail?

I've seen those things totally break people's outgoing mail.

Something else to check, they monitor all traffic on port 25



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  # 82042 11-Aug-2007 19:25
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I have removed AV and firewalls from both PC's with no luck.

I called TCL, and asked if they filter port 25, and they told me that they do not.


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  # 82067 12-Aug-2007 10:01
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Have you tried rebooting your cable modem?

I once had a problem where my internet connection seemed to be working correctly I could browse the web and receive e-mails but my Exchange server was queuing all my outgoing mail and nothing I did could fix it (I could even Telnet into other e-mail servers ok).

As a last resort I rebooted the cable modem and suddenly the outgoing mail started flowing again.



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