when entering email address (sender) on android both forms give" invalid email address" so forms cannot be sent.
on laptop and pc no problems form is sent normally
I cannot confirm this problem.
Current version of WebsiteBaker 2.13.1 r103 (https://addon.websitebaker.org/pages/en/browse-add-ons.php?id=0294EBA5) including p114 (https://addon.websitebaker.org/pages/en/browse-add-ons.php?id=0099E945) and php 8.0.x.
The form is submitted from Android
What version WB and php are you running
Maybe a browser plugin fills the honeypot fields?
Maybe a autofill plugin.
I had that issue with another App. Jump to Android settings / Cache management and clear the cache. This solution fixed my issue.
Dietmar
It could be that the virtual keyboard on Android appends a space character to the email address (which is not a valid character in email addresses).
Of course this blank should not be part of the email address - the keyboard just appends a space after each word you are typing in. Nobody would expect that it would be possible to submit email Addresses which contain a space at the end. So, we safely can discard space characters.
This is implemented since mpform 1.3.39 (November last year). So, maybe updating mpform helps for you, too?