ev. POST SMTP
SMTP Mailer By naa986 (proper debug view)
https://profiles.wordpress.org/naa986/#content-plugins
WP Mail Logging By SendLayer (a valuable tool in diagnosing issues with outgoing mails from the website)
https://profiles.wordpress.org/sendlayer/
Easy WP SMTP By Easy WP SMTP (Felsök händelser)
All you need to do is select the “Other SMTP” mailer and configure the correct SMTP host details.