Sylpheed fails to send email

NOTE: I had originally posted a description of this problem as a
followup to bug:
[ 692438 ] hangs when there is no authentication needed

I am using Sylpheed release 0.8.11 running 
on Windows 2000 Professional SP3.

There is no problem when receiving mail (I'm using a POP
account), but the SMTP connections
fail.  The connection hangs for some time and then sylpheed
returns an error message.  The error message is : "write on
fdxxx: Invalid argument"

If I do a netstat, I can see the connection to port 25 in
the mail server.

I can send email using the same account with other email clients.

I've included a copy of the log, both for the POP connection
and the SMTP.

[07:48:06] * message: Connecting to POP3 server:
mail.foo.com ...
[07:48:06] POP3< +OK MailSite POP3 Server 4.5.4.0 Ready
<[email protected]>
[07:48:06] POP3> USER [email protected]
[07:48:06] POP3< +OK [email protected] is welcome here
[07:48:06] POP3> PASS ********
[07:48:06] POP3< +OK erangel's mailbox has 1 message(s)
(5723 octets)
[07:48:06] POP3> STAT
[07:48:06] POP3< +OK 1 5723
[07:48:06] POP3> UIDL
[07:48:06] POP3< +OK unique-id listing follows
[07:48:06] POP3> LIST
[07:48:06] POP3< +OK 1 messages (5723 octets)
[07:48:06] POP3> RETR 1
[07:48:07] POP3< +OK 5723 octets
[07:48:07] POP3> DELE 1
[07:48:07] POP3< +OK message 1 deleted
[07:48:07] POP3> QUIT
[07:48:07] POP3< +OK mail3.foo.net POP3 server signing off
(mailbox empty)
[07:49:10] * message: Connecting to SMTP server:
mail.foo.com ...
[07:49:11] SMTP< 220 mail3.foo.net  MailSite ESMTP Receiver
Version 4.5.4.0 Ready
[07:49:11] SMTP> HELO foo.com
[07:49:11] SMTP< 250 OK
[07:49:11] SMTP> MAIL FROM: <[email protected]>
[07:49:11] SMTP< 250 [email protected] OK
[07:49:11] SMTP> RCPT TO: <[email protected]>
[07:49:11] SMTP< 250 [email protected] OK
[07:49:11] SMTP> DATA
[07:49:11] SMTP< 354 Ready for data
[07:49:11] * message: Quitting...[07:49:11] SMTP> . (EOM)
[07:50:34] ** warning: Error occurred while terminating data
[07:50:34] *** error: write on fd560: Invalid argument
[07:50:34] SMTP> QUIT
[07:50:34] ** warning: Error occurred while sending QUIT


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