mx1.dynu.com does not seem to honor status 450 mx1.dynu.com does not see...

Topic: mx1.dynu.com does not seem to honor status 450

Post mx1.dynu.com does not seem to honor status 450
by jguarini on 2017年4月19日

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

Reply with quote | Report
Post Re: mx1.dynu.com does not seem to honor status 450
by timothytw on 2017年4月20日

You are correct about this and we will create a setting (enabled by default) to handle this. IN the meantime, you can use the Delivery Address feature to permanently stop deliveries for unavailable mailboxes.

Thank you very much for this feedback!

Reply with quote | Report
Post Re: mx1.dynu.com does not seem to honor status 450
by rahsharma on 2017年4月21日

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?

Reply with quote | Report
Post Re: Re: mx1.dynu.com does not seem to honor status 450
by jguarini on 2017年4月24日

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?
Let me check on changing the response code. For reference, here is a sample log entry I'm seeing

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;

Reply with quote | Report
Post Re: mx1.dynu.com does not seem to honor status 450
by jguarini on 2017年4月24日

ok, now replying with 550. Let's see how that goes.

Thanks

Reply with quote | Report
2020年9月26日 21:40
Loading...