Bill Long wrote:
> CentOS root /root >telnet k2smtpout.secureserver.net 
> <http://k2smtpout.secureserver.net> 25
...
> Using the capture file, I opened it up in ethereal and did a follow 
> stream.
> here's the output of that.
>
> 220 k2smtpout02-01.prod.mesa1.secureservEHLO mail.longboys.net 
> <http://mail.longboys.net>
> 250-k2smtpout02-01.prod.mesa1.secureserv250-AUTH LOGIN PLAIN
> 250-8BITMIME
> 250 MAIL FROM:<[EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]>> 
> BODY=7BI250 Sender accepted.
> RCPT TO:<[EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]>>
> DATA
> 553 Sorry, that domain isn't in my list 503 You must send RCPT TO: first

Comparing the output of ethereal and your telnet log, I can see two things:

1: the host you're reaching is different in each case.  You reached 
k2smtpout04-01.prod.mesa1.secureserver.net via telnet, and 
k2smtpout02-01.prod.mesa1.secureserver.net via Courier.  It's possible 
that one of those hosts is not configured the same as the other.  If so, 
you'll have to contact the admins of that system to diagnose the problem 
further.  If I understand you properly, secureserver.net is providing 
you with SMTP service, right?  I'm not sure why they'd even look at the 
recipient's domain.

2: your dump file is garbage.  Those packets are definitely truncated 
and possibly out of order.  You should capture the stream with 
ethereal/wireshark if possible.  If not, try:
tcpdump -s0 -w/tmp/smtp.dump host k2smtpout.secureserver.net and port 25


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