php mail function fails because you are not checking already set ini values(?)

[f1-outsourcing]

Problem description

If I comment out this line, I am able to send email

PHPMailer/src/PHPMailer.php

Line 1937 in 05060d4

$params = sprintf('-f%s', $this->Sender);

Looking at this line

PHPMailer/src/PHPMailer.php

Line 866 in 05060d4

//Calling mail() with null params breaks

This is crap, this depends if your hoster has setup the ini var sendmail_path for you (and maybe protected it, so you can not change it). Even the php manual says it is OPTIONAL.

https://www.php.net/manual/en/function.mail.php

If I do print_r of params I see object values with something like this, so it looks like you are appending ini variables without even checking if they are already set, necessary or correct.
In any case the code that is trying to set this automatically is bad and worse than leaving params empty, so please remove this code asap.

[email protected]

So I guess your PHPMailer does not work in quite a lot of setups where just mail function is requested. I have 'dumb' wordpress developers whining that they need SMTP auth because this is not working.

I do hope you take into account with your coding that some ini vars are or can be protected (if I remember correctly).