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From: Daave on 9 Jun 2010 22:16
Richard John wrote:
> On 07/06/2010 5:50 PM, Richard John wrote:
>> When I send from my two computers running Windows 7 - one 32 bit one
>> 64, If I have a very large text message or an attachment of any size
>> (even a screen shot) the outgoing email message will stall. My old
>> desktop computer running XP does not have this problem.
>>
>> Any ideas? Thanks in advance
>> Richard
> My Internet provider found the problem and I will quote his response
> below.
> ""I found the issue with TB 3.0. Thunderbird defaults the outgoing
> mail server port to like 573. Probably so it can cache some info on
> disk. Once I changed that port to 25 it works fine.
>
>
> To change it click on Tools and then accounts. Select the Outgoing
> Server(SMTP) option on the left side pane. Select your account and
> click on edit. Change the port number to 25.""
>
> This is an odd quirk with Win 7 and Thunderbird 3 as a combination.

Thanks for letting us and others know. Was Thunderbird's SMTP port 25 on
the XP rig all along? (Or was it a different version of Thunderbird?
Maybe Windows 7 is a red herring.)


From: VanguardLH on 10 Jun 2010 04:30
Richard John wrote:

> On 07/06/2010 5:50 PM, Richard John wrote:
>> When I send from my two computers running Windows 7 - one 32 bit one 64,
>> If I have a very large text message or an attachment of any size (even a
>> screen shot) the outgoing email message will stall. My old desktop
>> computer running XP does not have this problem.
>>
>> Any ideas? Thanks in advance
>> Richard
> My Internet provider found the problem and I will quote his response below.
>
> ""I found the issue with TB 3.0. Thunderbird defaults the outgoing mail
> server port to like 573. Probably so it can cache some info on disk.
> Once I changed that port to 25 it works fine.
>
> To change it click on Tools and then accounts. Select the Outgoing
> Server(SMTP) option on the left side pane. Select your account and click
> on edit. Change the port number to 25.""
>
> This is an odd quirk with Win 7 and Thunderbird 3 as a combination.
> Richard

The install of TB3 does not use a default port of 573. It uses port 25
as the default when you define an email account. If port doesn't work,
you should next try port 587 (the port that e-mail clients are supposed
to use per RFC 2476).

RFC 2476 was ratified way back in December 1998 to correct an error in
port assignments. Port 25 was only supposed to get used between MTAs
(mail transfer agents; i.e., SMTP mail servers). It was not supposed to
get used by MUAs (mail user agents; i.e., e-mail clients). This RFC
stated that port 587 was supposed to get used by MUAs. However, ISPs
and e-mail providers didn't start complying until around 4 years later
and many still don't comply. As such, e-mail clients still default to
using port 25 when you define an e-mail account within them. Some
e-mail clients, like TB3, will attempt a test connect to the mail server
to determine on which port(s) it listens and offer to use that port, but
port 25 is still usually the default one used by e-mail clients.

That the e-mail account defined in TB3 was using port 573 means you
installed something else that modified your e-mail account's parameters.
Maybe you installed an extension, like some webmail proxy, and it
listens on port 573 (so your e-mail client has to use that port to
connect to that proxy) while the proxy uses 25 or 537 to connect to the
actual mail server. Maybe you installed anti-virus software whose proxy
listens on port 573 and it modified your e-mail account's settings.
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