Email "" does not comply with addr-spec of RFC 2822.

[kaspar-allenbach]

Upon sending the form I get the following error:

Email "" does not comply with addr-spec of RFC 2822.

I tried multiple emails adresses. none comply.
I disable non essential plugins. no effect

{{ input('email', 'fromEmail', submission.fromEmail ?? '', {
  id: 'from-email',
  autocomplete: 'email',
  placeholder: '[email protected]'
 }) }}
{{ submission ? _self.errorList(submission.getErrors('fromEmail')) }}

Additional info

• Craft version: 5.4.4
• PHP version: 8.3.10
• Database driver & version: MySQL 8.0.36
• Plugins & versions: Contact Form 3.1 / Contact Form Honeypot 2.1 / Contact Form Extensions 5.0.0