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EMail address being rejected

By MarkAPezza ·
I have a vendor who is attempting to send and email to me and it keeps getting rejected. We did some investigation and came down to the fact that the only strange thing about the email is it's From address.

The vendor can send emails from all their other email addresses except this one. The difference is that this address has a single quote in the name (ie. O'Conner@xyz.com).

Does anyone have any ideas why this would cause the email to fail?

I'm running Exchance 5.5.

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by lrund In reply to EMail address being rejec ...

Email addresses may have any of the following symbols/characters:

A-z (letters)
0-9 (numbers)
- (hyphen)
. (period)
_ (underscore)

Other symbols and spaces are NOT valid.

TBN

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by MarkAPezza In reply to

Poster rated this answer.

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by MarkAPezza In reply to EMail address being rejec ...

I found the actual problem. It ended up being that my Firewall SMTP Proxy blocked any emails with that character in the email. I added the ' to the list of accepted characters and it worked.

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by MarkAPezza In reply to EMail address being rejec ...

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