Outlook not delivering an email that when sent using Gmail arrives as - Microsoft Community


colleagues

good afternoon

when sending email outlook 3 recipients, 1 of them returned undelivered.

the message received follows (i've changed actual email address confidentiality reasons);

this message created automatically mail delivery software.

a message sent not delivered 1 or more of recipients. permanent error. following address(es) failed:

  ***email address removed due security reasons***

    host mx4.hotmail.com [65.55.33.119]

    smtp error remote mail server after rcpt to:<***email address removed due security reasons***>:

    550 requested action not taken: mailbox unavailable

the recipient's email address 1 use regularly.  2 of 3 recipients received copies of email no problem.

just check, sent copy of email same email address, gmail account.  this delivered no problem.

any thoughts why problem might occur?

many thanks

ian

***personal information deleted moderator. please see microsoft community asked questions more information on how can protect privacy***

which outlook version using ??

you can see article,, gives reasons why encounter said error : https://support.office.com/en-us/article/sent-email-in-outlook-com-comes-back-delivery-failed-45e048ac-f7b1-4c0f-b525-081cb34f1062



Office / Outlook / Windows 10 / Office 2016



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