error 550 relaying blocked. This only applies to one person in my mailing list.____ 550 relaying blo

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luke arkola

new computer running windows 7. Downloaded office professional and did an update of outlook. Everything seems to be running fine except for above problem. Have checked settings for outlook and believe they are set correctly. Can send and receive a test message. Got me stumped.

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Programs you are having problems with Error messages Recent changes you made to your computer What you have already tried to fix the problem
 

Diane Poremsky

Senior Member
Outlook version
Outlook 2016 32 bit
Email Account
Office 365 Exchange
What type of email account? What antivirus do you use? Does it scan outgoing email?

If you can send to everyone except this one person, the problem may be with their server, not yours, but if you use a virus scanner on outgoing email, you may need to add that ip address to the scanner's allow list.

 
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