An external sender was not being able to send email because Pure Message was blocking it but we are not sure why. Ran the Filtering Report for blocked hosts and the ip address did indeed show up as being blocked. We verified that the ip address is not included in the Transport SMTP Scanning filtering lists. Where else would this be getting blocked?
We had to turn off SMTP scanning in order for mail to be delivered.
We have included the domain in the Allow specific senders.
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