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Javier Ornelas writes: > Periodically, I receive calls from our users (on our Exchange Server) > who say that Mail.msu.edu users are trying to e-mail them, but are > receiving errors such as: > > This message was created automatically by mail delivery software. > > A message that you sent could not be delivered to one or more of its > recipients. This is a permanent error. The following address(es) failed: > > [log in to unmask] > SMTP error from remote mailer after initial connection: > host ht.msu.edu [35.9.86.5]: 554 <sys09.mail.msu.edu[35.9.75.109]>: > Client host rejected: too many connections > > Can someone help shed some light on what is causing these errors? Is > there something I need to change on our Exchange Server? As I said, it > is only periodically. Most of the time, there is no problem. If I'm reading this correctly, the mail server for ht.msu.edu is rejecting the incoming mail with a permanent error (code 554; 5xx codes indicate permanent errors) for what should be a transient condition. Your mail server should be returning a 4xx (temporary error) code, rather than a 5xx code. That would cause the sending mail system to retry the message, and (hopefully) eventually get through. Doug Doug Nelson, Network Manager | [log in to unmask] Academic Computing and Network Services | Ph: (517) 353-2980 Michigan State University | http://www.msu.edu/~nelson/