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You might need to set your fqdn properly on your SMTP server to match the A Record for your Exchange Server. I mean the A Record at your Hosted DNS (usually with your Domain Name Host or web host).<br />
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Here is a pic of where to set that:<br />
<br />
<a href="https://filedb.experts-exchange.com/incoming/2008/10_w40/65042/FQDN.bmp" target="_blank" class="file-inline" title="SMTP FQDN (1.4 MB)"><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>FQDN.bmp</a>
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You might need to set your fqdn properly on your SMTP server to match the A Record for your Exchange Server. I mean the A Record at your Hosted DNS (usually with your Domain Name Host or web host).

Here is a pic of where to set that:

FQDN.bmp [https://filedb.experts-exchange.com/incoming/2008/10_w40/65042/FQDN.bmp]

FQDN.bmp

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You do not have permission to send to this recipient. &nbsp;For assistance, contact your system administrator.<br />
&nbsp; &nbsp; &lt;email1.aaai.com #5.7.1 smtp;554 5.7.1 This message has been blocked because the return email domain is invalid.(failed to obtain DNS record for domain Myers-Clan.com)&gt;<br />

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You do not have permission to send to this recipient.  For assistance, contact your system administrator.
    <email1.aaai.com #5.7.1 smtp;554 5.7.1 This message has been blocked because the return email domain is invalid.(failed to obtain DNS record for domain Myers-Clan.com)>


Why am I receiving this error message on occassion

Interactions between email servers and clients are governed by email protocols. The three most common email protocols are POP, IMAP and MAPI. Most email software operates under one of these (and many products support more than one).  The correct protocol must be selected, and correctly configured, if you want your email account to work.

Email Protocols

The Domain Name System (DNS) is a hierarchical, globally distributed system responsible for associating the name of a computer, service or other resource into an IP address for connecting to the Internet or a private network. Most prominently, it translates domain names to the numerical IP addresses needed for the purpose of computer services and devices worldwide.