Hello. I work for Business Management Systems in Fairfax, VA. There is a problem with:
%mfromnot accepting DSNs for emails sent from that domain.
We and possibly many other ISPs require mail servers contacting us to follow
the minimum requirements for the functioning of mail over the Internet by
adhering to RFC 2821 (and others), which requires that a mail server accept for
the purpose of error reporting the null email address ("<>") in the
MAIL FROM:
command. See
Furthermore, many ESPs, for example verizon.net, validate the return-path of incoming emails by calling back to an MX for the domain. With DSNs not functioning, you will be unable to send emails to verizon.net and other mail servers that valid the return-path.
We ask if you would kindly contact those responsible for the "%mfrom" mail servers or if you have the means yourselves to resolve the issue so that "%mfrom" remains RFC compliant with respect to the use of the null address ("<>"). It is only a matter of time before some very important email goes undelivered and no one is notified of the problem.
Thank you for your time and attention in this matter,