<div>
Debugging MTA issues can be complex + time consuming.<br />
<br />
Likely best to open a Gig + hire someone to debug this.<br />
<br />
Or open a ticket in your MTA's &nbsp;support forums.
</div>


Debugging MTA issues can be complex + time consuming.

Likely best to open a Gig + hire someone to debug this.

Or open a ticket in your MTA's  support forums.

<div>
Show the entire log data for the SMTP ID of the issue above.
</div>


Show the entire log data for the SMTP ID of the issue above.

<div>
log exchange<br />
<a href="https://filedb.experts-exchange.com/incoming/2017/08_w33/1188553/RECV20170818-1.LOG" target="_blank" class="file-inline" title="log exchange (901 KB)"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512"><path d="M67.508 468.467c-58.005-58.013-58.016-151.92 0-209.943l225.011-225.04c44.643-44.645 117.279-44.645 161.92 0 44.743 44.749 44.753 117.186 0 161.944l-189.465 189.49c-31.41 31.413-82.518 31.412-113.926.001-31.479-31.482-31.49-82.453 0-113.944L311.51 110.491c4.687-4.687 12.286-4.687 16.972 0l16.967 16.971c4.685 4.686 4.685 12.283 0 16.969L184.983 304.917c-12.724 12.724-12.73 33.328 0 46.058 12.696 12.697 33.356 12.699 46.054-.001l189.465-189.489c25.987-25.989 25.994-68.06.001-94.056-25.931-25.934-68.119-25.932-94.049 0l-225.01 225.039c-39.249 39.252-39.258 102.795-.001 142.057 39.285 39.29 102.885 39.287 142.162-.028A739446.174 739446.174 0 0 1 439.497 238.49c4.686-4.687 12.282-4.684 16.969.004l16.967 16.971c4.685 4.686 4.689 12.279.004 16.965a755654.128 755654.128 0 0 0-195.881 195.996c-58.034 58.092-152.004 58.093-210.048.041z"/></svg>RECV20170818-1.LOG</a>
</div>


log exchange
RECV20170818-1.LOG [https://filedb.experts-exchange.com/incoming/2017/08_w33/1188553/RECV20170818-1.LOG]

RECV20170818-1.LOG

<div>
There should be some way to update Exchange to allow these through. &nbsp;<br />
<br />
If you have not done so already, I would tag this question with &quot;Windows&quot; and &quot;Exchange Server&quot; (or the actual valid categories).<br />
<br />
My area of expertise is *nix and sendmail or postfix
</div>


There should be some way to update Exchange to allow these through.  

If you have not done so already, I would tag this question with "Windows" and "Exchange Server" (or the actual valid categories).

My area of expertise is *nix and sendmail or postfix

<div>
<div class="content wysiwyg-content">
Hello I have a problem<br />
<br />
exemple@cpa.com The “MAIL FROM” address (“MAILER-DAEMON”, from header field “Return-Path”) was rejected.<br />
<br />
Thx!
</div>
</div>


Hello I have a problem

exemple@cpa.com The “MAIL FROM” address (“MAILER-DAEMON”, from header field “Return-Path”) was rejected.

Thx!

Problem MAILER-DAEMON

Within Internet message handling services (MHS), a message transfer agent or mail transfer agent (MTA) or mail relay is software that transfers electronic mail messages from one computer to another using a client–server application architecture. A MTA implements both the client (sending) and server (receiving) portions of the Simple Mail Transfer Protocol (SMTP). The terms mail server, mail exchanger, and MX host may also refer to a computer performing the MTA function. The Domain Name System (DNS) associates a mail server to a domain with mail exchanger (MX) resource records containing the domain name of a host providing MTA services.