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I am getting "Mail Delivery Failed" messages for some of the emails sent.

As I am replying an email, I am sure that there isn't any misspelling on the recipient's email address.

A typical message below.

On 22/06/2015 9:47 am, "Mail Delivery System" wrote:

This message was created automatically by mail delivery software.

A message that you sent could not be delivered to one or more of its recipients. This is a permanent error. The following address(es) failed: ...

Any help would be very much appreciate.

Thanks in advance.

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  • One of the recipient used a corrupt email address, you are going to have to check them
    – Ruskes
    Commented Jun 22, 2015 at 2:43
  • The interesting part of the delivery failed-message is a few lines below the part you've included already, can you include that as well?
    – nohillside ♦
    Commented Jun 22, 2015 at 9:08
  • This is the full message: On 22/06/2015 10:47 pm, "Mail Delivery System" ><[email protected]> wrote: > >>This message was created automatically by mail delivery software. >> >>A message that you sent could not be delivered to one or more of its >>recipients. This is a permanent error. The following address(es) failed: >> >> [email protected] >> host something.something.net [000.0.00.0] >> SMTP error from remote mail server after RCPT >>TO:<[email protected]>: >> 553 IP 11.11.111.1 is UCEPROTECT-Level 1 listed. See >>uceprotect.net/rblcheck.php?ipr=22.22.
    – K...
    Commented Jun 22, 2015 at 23:52

2 Answers 2

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It is possible that the mail was sent from a disposable e-mail address. If that's the case then mail sending will be failed.

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The error is on their end, not yours, and that is where the response is coming from. The best you can do is contact the intended recipient via another method and have them check their email account.

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