Email provider blocked incorrectly

A very good day to you,

I’m using a “Contact From 7” to send an email for users to register to events. One of our users has an emailadres in the domain of “@concepts.nl” and this gives and error. If I disable Akismet it does send the email correctly. I found this old topic with a simillar problem: https://www.ads-software.com/support/topic/content-form-author-domain-problem/

If this can be fixed it would be greatly appreciated.

• This topic was modified 1 year, 4 months ago by tobiasb92.

The page I need help with: [log in to see the link]