I think I have founded the problem...

The version of PHP!

I have installed on the same host another website... he have the v7.3 of php on the new... and on my website I have the v7.4...

can you test with the v7.4 ???

Hello,

The test on the "new website" isn't correct, sorry...
I have changed the version of PHP... It's better but not completly ok !

This is my test, I add the printscreen :

The picture "Visitor" it's a simple visitor not registred, he don't receive the e-mail, you can view the message, he don't send the e-mail !

The second with the registred user, receive the newsletter !

Your app don't send e-mail when the user isn't a register user on the website...

Have you the same problem with your test ?

thanks for your help

I register on the event of the 19 sept at 14.00 (2pm)

I have receive the confirmation...

Now can you try to use your Newletter option with this date to send more info...

I wait you newsletter...

receive...

I don’t understand...
what’s your version of php?
what’s your parameters of joomla? (fopen & other)

changed on php send email + good version of php

problem resolved!

thanks for your help!