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An SMTP protocol error occurred.

Posted on 2006-06-27
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Last Modified: 2007-12-19
Hello

We are having problems sending email to the domain sympatico.ca.  Messages continually queue up, but do not get sent.  We are running Windows 2003 with Exchange 2003.  

If anyone can assist me in troubleshooting, I would greatly appreciate it!
Thansk.
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Question by:Spuggin
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Sembee earned 2000 total points
ID: 16995801
I think they may have a problem.

http://www.dnsreport.com/tools/dnsreport.ch?domain=sympatico.ca

ERROR: I could not complete a connection to any of your mailservers!

ERROR: toip5.bellnexxia.net Greeting indicates server is down: 421 #4.4.5 Too many connections to this host. .
toip5.bellnexxia.net: The mailserver terminated the connection before the transaction was complete (state 2). This is not RFC compliant, and therefore either due to an error, or it may be the result of a non-RFC-compliant mailserver or non-RFC-compliant anti-spam program.
ERROR: toip7.bellnexxia.net Greeting indicates server is down: 421 #4.4.5 Too many connections to this host. .
ERROR: toip4.bellnexxia.net Greeting indicates server is down: 421 #4.4.5 Too many connections to this host. .
ERROR: toip3.bellnexxia.net Greeting indicates server is down: 421 #4.4.5 Too many connections to this host. .
ERROR: toip6.bellnexxia.net Greeting indicates server is down: 421 #4.4.5 Too many connections to this host. .
ERROR: toip2.bellnexxia.net Greeting indicates server is down: 421 #4.4.5 Too many connections to this host. .
ERROR: toip1.bellnexxia.net Greeting indicates server is down: 421 #4.4.5 Too many connections to this host. .
toip7.bellnexxia.net: Timed out [Last data sent: HELO test.DNSreport.com ]
toip1.bellnexxia.net: Timed out [Last data sent: HELO test.DNSreport.com ]
toip2.bellnexxia.net: Timed out [Last data sent: HELO test.DNSreport.com ]
toip3.bellnexxia.net: Timed out [Last data sent: HELO test.DNSreport.com ]
toip4.bellnexxia.net: Timed out [Last data sent: HELO test.DNSreport.com ]
toip6.bellnexxia.net: Timed out [Last data sent: HELO test.DNSreport.com ]

That looks like a DOS attack is in progress.
Can't be sure from this side of the pond though.

Simon.
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Author Comment

by:Spuggin
ID: 16995855
Thanks!

That result seems to jive with what I found here: http://www.checkdns.net/quickcheck.aspx?domain=sympatico.ca&detailed=1

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