jguarini wrote:When email is being delivered I still perform valid domain checks. The system will then return stars 450 like so

450 4.1.8 <Cut_the_Cord@circus.selfiji.us>: Sender address rejected: Domain not found;

It appears that mx1 does not interpret this properly and attempts to resend the email. What is the expectation for the Email Store/Forward service when the destination does not want to accept the email?

thanks

rahsharma wrote:

jguarini wrote:When email is being delivered I still perform valid domain checks. The system will then return stars 450 like so

450 4.1.8 <Cut_the_Cord@circus.selfiji.us>: Sender address rejected: Domain not found;

It appears that mx1 does not interpret this properly and attempts to resend the email. What is the expectation for the Email Store/Forward service when the destination does not want to accept the email?

thanks

Actually, 450 is a temporary error while 550 would be the permanent error. Couple examples below:

450 Requested mail action not taken: mailbox unavailable (e.g., mailbox busy)

550 Requested action not taken: mailbox unavailable (e.g., mailbox not found, no access, or command rejected for policy reasons)

Would you be able to configure your email server to respond with 550 instead of 450?

wrote:Apr 24 19:39:23 mail postfix/smtpd[9573]: NOQUEUE: reject: RCPT from mx1.dynu.com[207.38.70.35]: 450 4.1.8 &lt;WarrantyNotice@dead.warrantycarsdirected.u&gt;: Sender address rejected: Domain not found; from=&lt;WarrantyNotice@dead.warrantycarsdirected.u&gt; to=&lt;zzzz@XXX.yyy&gt; proto=ESMTP helo=&lt;mx1.dynu.com&gt;