special character in an email - Display name not email address

philb19
philb19 used Ask the Experts™
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Hi - Spammed user in our system is being trapped frequently. by external email systems flagged as junk
Here is the rub - The user has a display name with a special character umlaut double dot..

https://stackoverflow.com/questions/15121359/are-international-characters-e-g-umlaut-characters-valid-in-the-local-part-of

the display name has this character  in one letter. - Id like to understand where the display name is analyzed by an email system if at all. using what mechanism - her email address does not contain the special character. so her display name is different than her email address - hos does email system work to check this - Is the only option to remove it from her display name - its a o365 exchange online user.

thanks
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Most Valuable Expert 2015
Distinguished Expert 2018

Commented:
That's a question you should be directing to the support folks of the spam system that's marking it. There's absolutely no problem having an umlaut in your display name as far as O365 is considered, it's perfectly supported and it should not result in any false positive detections. Check with the recipient's side, ask them to provide you headers just in case and have them investigate on their end why exactly is said user being blocked. I'd guess that it's most likely something in her signature or similar.

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Commented:
Thanks can you comment on these then please:

https://community.spiceworks.com/topic/1960683-adding-names-with-umlauts-to-active-directory

Yeah I wouldn't recommend any special chars in email addresses or login names.

Your system "might" eventually accept them but many other email systems will not. We've had an issue recently with mail bouncing to a company. Turned out their server didn't even like a capitol letter in the email address the user typed in.

We've also had trouble with ' in people's names and addresses.


and this:


https://stackoverflow.com/questions/15121359/are-international-characters-e-g-umlaut-characters-valid-in-the-local-part-of

Yes, they are valid characters as long as the mail exchanger responsible for the email address supports the UTF8SMTP extension, discussed in RFC 5336.
Beware that just a small portion of the mail exchangers out there supports internationalized email addresses.


plus possibility of display name spoof display name different to email address
Most Valuable Expert 2015
Distinguished Expert 2018

Commented:
What does display name has to do with actual email address or UPN? Those are different attributes, and yes, they do have some stricter requirements for valid characters. But display name is "safe".

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