PHPMailer not working in infinityfree but works on localhost

[UnknownLolz]

Could you refer to the following posts:

PHPMailer Not working on Infinityfree but works offline

This is normal. Gmail does not allow you to send email with a sender address which is not on the account. Which effectively means you will always send with an @gmail.com address. There is no way to “fix” this, other than using a different email provider which does allow you to use your own sender address.

PHPMailer doesn't work

I checked your code, and I think the issue is caused by an include loop. In the code you shared, you have the line require ("PHPMailer.php");. However, I have checked this file “PHPMailer.php”, but that file also contains a script like what you’ve shared here. Can you please make sure the file PHPMailer.php contains the actual PHPMailer library, and see if you can have another script which uses that library?

PHPMailer not working

I think the issue is the combination of the port and the security. If $mail->SMTPSecure = 'ssl', then the port number you should use is probably 465. If you use port 587, it should be combined with $mail->SMTPSecure = 'tls'. You can use port 465 or port 587, but normally they use different encryption. And your configuration should reflect that.