SMTP

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/

https://sendlayer.com/

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.