Outlook 2013 - Error message "550 Request failed; Mailbox unavailable"

  • Thread starter Thread starter LTart
  • Start date Start date
L

LTart

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Hello,

I have been using Outlook 2013 for a while without problems but recently I have started having issues when emailing.

I frequently send emails for my boss and have the replies directed back to his email. I have also tried changing "from" to his email address so that it looks like it comes directly from him.

Recently, when I try to do either of these actions I get the email back with the message: 550 Request failed; Mailbox unavailable.

I have no issues when I leave my email address as the "from", or have the replies just come back to me.

Any suggestions? Thanks in advance!

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