Sendmail support for relaying denied and did not issue MAIL/EXPN/VRFY/ETRN
Sendmail did not issue MAIL/EXPN/VRFY/ETRN during connection to MTA
Possible Fix: The client may not be authenticating properly with the mail server. If the client authentication is selected then try setting the authentication mode to “pop then smtp”
(may be forged), reject=550 … Relaying denied
Possible Fix: Often you will get relay denied because of DNS issues check that you have added all the host names in the /etc/hosts file and that the server can resolve the hostname for your MX record and all host names associated with the domain and IP addresses.
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