> I am getting the following error from a few isolated emails out of several > 1000.
And are these e-mails going to the same recipient MX? The logs you posted indicate that the remote server is attempting to perform DNS-only "sender address verification"--that is, they want to make sure that your domain can receive mail, but they will not necessarily then attempt to connect via SMTP to see if your username exists (as will some servers). The causes could be intermittent failure of your DNS server, intermittent connectivity or routing issues on your end or theirs, misconfiguration of their resolver settings, etc. -Sandy ------------------------------------ Sanford Whiteman, Chief Technologist Broadleaf Systems, a division of Cypress Integrated Systems, Inc. e-mail: [EMAIL PROTECTED] ------------------------------------ To Unsubscribe: http://www.ipswitch.com/support/mailing-lists.html List Archive: http://www.mail-archive.com/imail_forum%40list.ipswitch.com/ Knowledge Base/FAQ: http://www.ipswitch.com/support/IMail/
