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Incoming Mail Issues / Error 550 - MX records inaccessible

PTS

New Pleskian
We're having some issues getting mail to come through from certain external networks.

One of our vendors is getting this error when trying to email us:

Action: failed
Status: 5.5.0
Diagnostic-Code: smtp;550 MX records inaccessible for too long for domain: ourdomain.com - psmtp

Additionally, we can't get email sent to us from yahoo.com accounts. This error pops up:

Sorry, we were unable to deliver your message to the following address.

<[email protected]>:
No MX or A records for senecagames.com
 
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