Could not instantiate mail function

Hallo all,
I'm having a problem with the mail function.
I get the error "Could not instantiate mail function" in the mail log table.
I tried the MAIL method but I get this error.
Then I tried the SENDMAIL method but it doesn't work either.

I have other pages on the same server that are using the old ADDT extensions and the emails work properly.
Now I need to use the WA extensions but they don't work on this server.

Here attached a link to the server phpinfo.

How can I troubleshoot this problem?

TIA
tony

It could be a few things. Your receiver email address maybe is not valid. Your mail server may refuse to deliver your message if the receiver email address is not a valid one.

If you have " could not instantiate mail function" for only a few of your subscribers, it may just be because their email address is not valid.

It could also have something to do with the size of the email if you are adding attachments.

Hello Ray,
thanks for your reply.
You were right: it was the sender email address. It needs to be a valid one.
I was testing using a fake address.
Thanks again.
Tony