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experiancing smtp connection reset during Helo to multiple Domains

We are having an issue that just recently started in which the SMTP connection is being dropped or reset folowing Helo. This is only occuring with a couple of domains that I know of. I have verified we are not on any blacklists and I am trying to contact the admins for the domains to find out if they know why we are being reset. I am looking for any information on what would cause a reset after Helo. I should note that we are using a Barracuda appliance as our smtp gateway, but it has been working without issue for several months.

Thank You for your assistance
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Mavant
Asked:
Mavant
1 Solution
 
sardiskanCommented:
Check your SMTP log file to fine out what the specific reason for the reset it.

Also, if this only happens on a couple of domains, its possible these domains, though different, are using the same email server to accept and process messages. Which means it might just be a problem with the remote mail server.
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leakim971PluritechnicianCommented:
Hello Mavant,

HELO ? And EHLO ?

Regards.
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Alan HardistyCommented:
Please have a read of my article which might highlight an inconsistency with your server / Domains configuration etc.
http://www.experts-exchange.com/Software/Server_Software/Email_Servers/A_2427-Problems-sending-mail-to-one-or-more-external-domains.html 
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