Errors because of a mail address with a ?

See Setting up mail

What email settings do you have in the Mail tab panel?

To protect personal data, hiding email addresses in the settings or replacing them with dummy addresses is strongly advised. You can also include screenshots.

Hi,

To: [email protected]

From: D?R [email protected]

Of course the xxxx is an word, but I made it x’s for privacy reasons.

Can you please include a screenshot of it?

Yes of course:

Did you change the From field?

Also, since Contact Form 7’s config-validation doesn’t support Punycode yet, you should have a configuration error at the From field. Have you disabled it?

No I have not disabled config-validation, when I type @wijzijnd?r.com it does give a error. But the webfriendly version of the url is @xn--wijzijndr-s8a.com. I already tried every possible option in the from field.

Thanks for your help, but nothing works. I installed Gravity Forms, this plugins works like a charm.