I use Web form builder but response is not delivered to some email adresses. Get the following response from the e-mail provider:

This is the mail system at host s554.loopia.se.
I'm sorry to have to inform you that your message could not be delivered to one or more recipients. It's attached below.
For further assistance, please send mail to postmaster.
If you do so, please include this problem report. You can delete your own text from the attached returned message.
The mail system
<k-lindem@online.no>: SMTPUTF8 is required, but was not offered by host
mx.online.no[193.213.115.10]

Hei Kåre,

See if you can find some solution someplace here: https://www.google.com/search?q=smtputf … =firefox-b

I've never had that error, but it seems common enough.

Hilsen
Inger
(a fellow Norwegian)