Recipient address rejected: Rejected by SPF


New Member
Aug 1, 2023
Hello, today we found that some letters do not reach the addressee. we have a hybrid infrastructure exchange. receives mail while o365 then sends PMG. we noticed that if the user is in onpremises, then the mail is blocked due to the wrong SPF. although initially the mail comes with the correct IP address.

we have several domains, some listings are included, some are not

in o365, mail comes from the correct IP address, but where it goes to pmg changes there
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