Allow null sender for contact form

Current workaround : cf. patch attached.

I can't reproduce this. When sending as anonymous then there is a box to put your email address in. Perhaps you have disabled the field on your site?

Indeed, could it be that the switch from Swiftmailer to Symfony Mailer has introduced these fields ?
In our case, it seems preferable not to add those fields to the existing forms.

Indeed, could it be that the switch from Swiftmailer to Symfony Mailer has introduced these fields ?

No, the field I refer to is part of Core.

In our case, it seems preferable not to add those fields to the existing forms.

Interesting I'm surprised that it worked without using this module. I had imagined that this field is mandatory.

I believe that the right fix is in ContactEmailBuilderBase

- if ($email->getSubType() == 'mail') {
+ if ($sender && $email->getSubType() == 'mail') {

I can confirm that the patch in #2 works.