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https://answers.microsoft.com/en-us/outlook_com/forum/osecurity-osafe/i-keep-receiving-a-postmaster-delivery-failure/d225f4a4-2533-42fe-babb-e53c3da674b1
Feb 10, 2015 · I keep receiving a Postmaster Delivery failure regularly even though i havent sent anything. Hi, I have received multiple Postmaster failure email notification even though i …
https://support.office.com/en-us/article/Sent-email-in-Outlook-com-comes-back-delivery-failed-45e048ac-f7b1-4c0f-b525-081cb34f1062
Delivery failures, or emails that bounce or come back as undeliverable, can happen for several reasons. When you send an email and receive a delivery failure message, there could be several reasons.
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