[SM-USERS] Problems sending from SquirrelMail running on WinXP IIS

[Wayt G. <way...@gm...>]

I have SquirrelMail running on a fast (2.4GHz P4) WinXP box using IIS and
PHP5, and connecting to an Courier IMAP and SMTP server hosted by a
third-party professional service (Dotster). Everything works fine except for
sending messages, which intermittently fail ~ 30seconds after I hit the Send
button with the error:

*Notice*: fputs()
[function.fputs<http://71.231.7.132/squirrelmail/src/function.fputs>]:
send of 78 bytes failed with errno=0 An established connection was aborted
by the software in your host machine. in *
C:\Inetpub\wwwroot\squirrelmail\class\deliver\Deliver.class.php* on line *
262*

*Fatal error*: Maximum execution time of 30 seconds exceeded in *
C:\Inetpub\wwwroot\squirrelmail\class\deliver\Deliver.class.php* on line *
263*
PHP Notice: fputs()
[function.fputs<http://71.231.7.132/squirrelmail/src/function.fputs>]:
send of 78 bytes failed with errno=0 An established connection was aborted
by the software in your host machine. in
C:\Inetpub\wwwroot\squirrelmail\class\deliver\Deliver.class.php on line 262
PHP Fatal error: Maximum execution time of 30 seconds exceeded in
C:\Inetpub\wwwroot\squirrelmail\class\deliver\Deliver.class.php on line 263

Oddly, the timeout error occurs even with very short, plain text messages
(the one that produced this error was <1k in size). The WinXP box does
hardly anything other than run Squirrelmail, so it is not a processor
bottleneck issue. And I never have problems sending from Outlook using the
SMTP server, so I don't think there is a bottleneck there. Sending does work
sometimes, so I'm fairly certain that authentication and server config is
set up properly.

Any suggestions would be most appreciated.