Hi there,
I have noticed that the error below is happening in most of the emails we are sending to Microsoft accounts:
Email FALIED to send. Reason USER UNKNOWN. Text: 550.5.5.0. Requested action not taken: mailbox unavailable.
Do you know what are the reasons why a mailbox would be unavailable? Is there any way to fix this?
Cheers, C
Solved! Go to Solution.
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Whomever you are trying to send an email delivery to, that email does not exist under that particular domain, hence;
[REQUEST] Adobe ---- send email to someone@someone.com
[RESPONSE] Server at someone@someone USER IS UNKNOWN
Adobe then places this recipient under quarantine.
More info --> Adobe Campaign Help | Managing quarantines
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Whomever you are trying to send an email delivery to, that email does not exist under that particular domain, hence;
[REQUEST] Adobe ---- send email to someone@someone.com
[RESPONSE] Server at someone@someone USER IS UNKNOWN
Adobe then places this recipient under quarantine.
More info --> Adobe Campaign Help | Managing quarantines
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I also have gotten this message, but only with one email address. The domain is att.net, yet I get the 550 error saying that the outlook.com mailbox is not available. The message did go through to the att.net address, but I still get this error message:
xxxxx.xxxxx@outlook.com
550: 5.5.0 Requested action not taken: mailbox unavailable (S2017062302). [AM0EUR02FT019.eop-EUR02.prod.protection.outlook.com 2023-07-28T18:40:19.371Z 08DB8F962833A069]
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