Many e-mails

Hi,

We have been using Contact form 7 for several sites. Now we are using it for a new customer. The customer is receiving hundreds of repeating e-mails from the contact form we created. The strange thing is, when we use our own e-mail address, everything works fine. It’s just when we choose their e-mailaddress (doesn’t mather which one) they get burried under hundreds of the same e-mails (with the same message from the contact form). Same contact form, just another e-mailaddress.

Normally they don’t have any problem with their e-mail. What could be the cause? We really have difficulties pinpointing the problem here (it’s in the combination of their e-mail and contact form 7), and it’s not convenient for the customer of course. Can it be something in the header? More important, what’s the solution?

Thanks!

Best regards,
Marc

https://wordpress.org/plugins/contact-form-7/