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Gentlemen, thank you very much, it worked, I believe that clearing the cache as instructed resolved the problem! Thank you so !

Then either they are not telling the truth or you are missing something! Because when configured properly mails do work, I can say you that and provide evidence to prove that Check your logs for errors and please follow the docs for required details when requesting help. Good luck

https://docs.phpvms.net/config/email#smtp-configuration It simply says ; For detailed settings about host, port and encryption details please check your hosting control panel (or VPS). These settings are not generic and can differ between hosting companies, even on a custom VPS these settings are local to your install (packages installed etc.) Therefore there a no generic examples for SMTP and mail settings. Just don't forget to clear application cache when you make .env changes.

Are any emails being sent/received? Emails for new news items, PIREPs being submitted, etc? How emails ever worked? Double check with your email provider/host that you are using the correct hots, port, encryption settings.