Let me preface my remarks by saying what a great product Courier is and I appreciate all the work Sam does on it.
I have a problem with an anti-virus product MailMonitor from Sophos which insists on trying to send mail to <postmaster>. This is rejected by Courier with the following error: to=<postmaster>: 513 Syntax error. The result of this problem is that Courier rejects the mail then MailMonitor immediately tries to notify <postmaster> of the rejection, etc. ad. infinitum. I have complained to Sophos but they respond saying that RFC 2821 section 4.5.1 specifically states that this is a valid address and it's not their fault. To quote part of this RFC: "The requirement to accept mail for postmaster implies that RCPT commands which specify a mailbox for postmaster at any of the domains for which the SMTP server provides mail service, as well as the special case of "RCPT TO:<Postmaster>" (with no domain specification), MUST be supported. "SMTP systems are expected to make every reasonable effort to accept mail directed to Postmaster from any other system on the Internet. In extreme cases --such as to contain a denial of service attack or other breach of security-- an SMTP server may block mail directed to Postmaster. However, such arrangements SHOULD be narrowly tailored so as to avoid blocking messages which are not part of such attacks. Anyone got any ideas of how to get around this problem? Regards Greg Johnstone ------------------------------------------------------- This sf.net email is sponsored by:ThinkGeek Welcome to geek heaven. http://thinkgeek.com/sf _______________________________________________ courier-users mailing list [EMAIL PROTECTED] Unsubscribe: https://lists.sourceforge.net/lists/listinfo/courier-users
