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L. Mark Stone - General Manager, Managed and Private/Hybrid Cloud Services
"Uptime. All the time." ® www.reliablenetworks.com
Eleven Years In Business 2003 - 2014
477 Congress Street, Suite 812 | Portland, ME 04101 | (207) 772-5678
private/hybrid cloud hosting | Zimbra
Any chance there is a UTM device in the email stream?
We see lots of these errors when our SonicWalls do an RBL lookup, don't like
the data in the email stream etc. The SonicWalls then just drop the connection
and Postfix logs the drop.
Hope that helps,
Mark
