Hey guys, wanted to see if I can can get any input on this here - had to Geoblock one of the countries for inbound/outbound traffic completely. Everything was fine until I found out that one of the employees started having issues with email delivery to the certain customer - "domain of sender address firstname.lastname@example.org does not resolve email@example.com". Turns out mail servers of this certain customer (as well as other server infrastructure) located in that Geoblocked zone. Tried to identify range of their public addresses and allow inbound/outbound dns and smtp applications from my mail server and on-prem dns servers (just in case). Issue still exists. No problems/issues with incoming emails from firstname.lastname@example.org. Will appreciate any help/suggestions. Thanks.
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