Outlook/Exchange Error: #5.1.1 smtp;550 5.1.1 RESOLVER.ADR.ExRecipNotFound; not found

When you receive errors like < #5.1.1 smtp;550 5.1.1 RESOLVER.ADR.ExRecipNotFound; not found>, when you are sending emails and those email bounce back creating Non Delivery Recipients. You don’t know what to do and what is exactly going on with the error? I faced the same error for the first time.

Looking at the error codes given here (http://www.emailaddressmanager.com/tips/codes.html) it seemed “Bad Destination Mailbox”. But when I saw others were sending mails to that mailbox without any trouble. I searched for many forums but not succeeded. Finally, I got it resolved.

What causes this?
When you have shared your calendar to another contact, this usually creates issues and you may face similar kind of error messages.

Resolution:
Simply, unshare your calendar. And if you really want your invites to be shared with some other contacts? Make a rule that will forward your meeting requests to other contacts. This will resolve issues.

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One thought on “Outlook/Exchange Error: #5.1.1 smtp;550 5.1.1 RESOLVER.ADR.ExRecipNotFound; not found

  1. Pretty nice post. I just stumbled upon your blog and wished to say that I have really enjoyed browsing your blog posts. In any case I will be subscribing to your rss feed and I hope you write again soon!

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