Please be careful about info on the internet
Theres a lot of data and not so much information.
Since PHP5.3 the smtp extension has been built into the core of PHP i.e. YOU DONT NEED TO INCLUDE AN EXTENSION ANYMORE. Its all built in!!!!
A quick look at the PHP.NET site would probably have told you that.
When debugging the problem .... try lookong at the 'php error log' and the 'apache error log'
Try turning PHPMailer->Debug on
What version of PHP were you using before?
What version of PHP are you using now?
What version of PHPMailer have you installed??
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(Windows 10 Pro 64bit) (Wampserver 3.3.4 64bit) Aestan Tray Menu 3.2.5.4
<Apache versions MULTIPE> <PHP versions MULTIPLE> <MySQL Versions MULTIPLE>
<MariaDB versions MULTIPLE> <phpMyAdmin versions MULTIPLE> <MySQL Workbench 8.0.23>Read The Manuals Apache --
MySQL --
PHP --
phpMyAdminGet your Apache/MySQL/mariaDB/PHP ADDONs here from the
WAMPServer alternate Repo-X-X-X-
Backup your databases regularly Here is How dont regret it later! Yes even when developing -X-X-X-