On Mon, 29 Jan 2007 13:29:18 -0600, Jesus Alonso Rivas y Rivas
<[log in to unmask]> wrote:

>Hi, we still have the same problem, see attached file please (wireshark 
>software, network analyser) at the last line, listserv brakes the 
>connection.

Add the following line to site.cfg, then stop/restart LISTSERV

 SMTP_DEBUG=1

This turns on additional logging of the SMTP 'conversation' between LISTSERV's
'SMTP Workers' (sending the outgoing mail) and the mailer where the outgoing
mail is sent.  This is useful for troubleshooting problems like this.

excerpt from Logfile SMTPS#1-20070129.LOG:

>29 Jan 2007 14:21:20 <220 mail.besteffort.com ESMTP MailEnable Service, Version: 0-2.36- ready at 01/29/07 14:21:20
>29 Jan 2007 14:21:20 >EHLO MAIL03
>
>29 Jan 2007 14:21:20 <250-besteffort.com [127.0.0.1], this server offers 4 extensions
>29 Jan 2007 14:21:20 <250-AUTH LOGIN
>29 Jan 2007 14:21:20 <250-SIZE 10120000
>29 Jan 2007 14:21:20 <250-HELP
>29 Jan 2007 14:21:20 <250 AUTH=LOGIN
>29 Jan 2007 14:21:20 >MAIL FROM:<>
>29 Jan 2007 14:21:20 <250 Requested mail action okay, completed
>29 Jan 2007 14:21:20 >RCPT TO:<[log in to unmask]>
>29 Jan 2007 14:21:20 <250 Requested mail action okay, completed
>29 Jan 2007 14:21:20 >DATA
>29 Jan 2007 14:21:20 <354 Start mail input; end with <CRLF>.<CRLF>
>29 Jan 2007 14:21:20 <250 Requested mail action okay, completed

Remember to remove or comment-out the line after you complete troubleshooting.
Otherwise your logfiles will grow very large.