<p><strong>Problem:</strong></p>
<p>When sending mail to a remote server, you may receive a message similar to the following:</p>
<p>553: Sorry, that domain isn't in my list of allowed rcpthosts</p>
<p><strong>Resolution #1:</strong></p>
<p>This error message indicates that the remote server has rejected your message due to your host not being on a list of servers able to send to the destination server mail. This error can also indicate that your e-mail address or server is listed on a DNS blacklist. You will need to contact the remote server administrator for assistance with this issue. This error implies there is a problem with the remote host.</p>
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<p><strong>Resolution #2</strong></p>
<p>A message like this often indicates the remote host is checking for valid permissions to send.  Usually this is satisfied by having an MX record pointing to custommail.hyperoffice.com (our mail record), but sometimes it looks specifically for an SPF record. </p>
<p>A SPF record for our Internal Mail servers would look like:</p>
<p>v=spf1 a mx ip4: 128.121.14.0/254 ?all</p>
<p>For the name-services.com domain (Enom's Sending domain), the spf record would be (<a href="https://www.trustedsource.org/query/name-services.com">https://www.trustedsource.org/query/name-services.com</a>):</p>
<p>v=spf1 a mx ip4: 62.229.62.0/24 ip4:69.64.144.0/20 ipv4:98.124.192.0/18 ?all</p>