What are valid characters in an e-mail address? How to filter on the email addresses that use '? ' and ' * '?

I'm doing some proactive cleaning the contacts whose e-mail address contains characters that are questionable - such as

Unfortunately, I found that I can't create filters for addresses that contain? or * because these two characters are treated as wildcards (? is for a single wildcard character, and * is the joker of several characters).

Someone at - it suggestions on how I can filter for a group of e-mail addresses containing one of these characters?

Update: open a folder with support - special characters * and?  are not allowed in the domain of the email address part.  That's what is validated during creation.

It is also not really any EASY way to get those email addresses that contain these characters - I can create filters that will shoot only so many email addresses and then filter through Excel.  This is going to be painful because I have several million in our database.  I may be able to get many of them through other criteria (lack of activity, rebounds, etc.), so I'll probably wait on them.

Tags: Marketers

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