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We're running the latest version of SM4, and have a client who reports that some of his messages never reach his recipients, particularly ones with attachments. He's using Outlook 2003 w/ SMTP AUTH. I took a look at our SMTP logs and noticed several occurrences of the following, where it appears...

On the surface this could appear simply to be a DNS related issue but DNS is OK and yet our clients simply can not reliably deliver - the session simply times out - at MailWise - specifically at the load balancers that sit in front of the mail servers. My own mail traffic with one of the recipients ...

I've got a SmarterMail server that is acting as a gateway to another SmarterMail server. The gateway server simply domain forwards everything for a specific list of domains onto the main server (after greylisting, etc.). Some mail is being rejected with the following message in the SMTPlog: - rsp: 552...

Hello My smtplog.log has error after error like the one below (with different ip addresses) 10:51:45 [81.15.200.237][3539136] Exception: System.Net.Sockets.SocketException: An existing connection was forcibly closed by the remote host at System.Net.Sockets.Socket.EndReceive(IAsyncResult asyncResult)...