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URGENT NOTICE : Email deliverability of MSPs using Microsoft are affected
Note: Fixed email delivery issues for error code "451 4.7.50 Server is Busy" in Exchange Online. In the last few days, we've received several tickets related to emails not reaching end users due to Microsoft's SMTP server rejecting emails with the following error “451 4.7.500 Server busy. Please try again later from…
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IMPORTANT: Upcoming SMTP server change
Last updated: 01/20/2022 - Attention BullPhish ID customers, We are moving to a new SMTP server, “34.237.252.20” to improve the phishing simulation email deliverability. We are currently in the migration phase, and the new SMTP server will be LIVE in January 2022. Your campaign email deliverability can be affected if the…
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IMPORTANT: Changes to BullPhish ID Sending domains effective OCT 21 '2021
Last updated Q4'2021: Microsoft reverted the change and no more limited the number of domains to be whitelisted. Attention BullPhish ID customers (Oct 21), Earlier this year, Microsoft announced that it was changing the behavior of override functions in Exchange Transport Rules (ETR) to high-confidence spam/phishing,…