
icomm SMTP sends WordPress mail through a mail provider SMTP server instead of the server PHP mail() function. This WordPress.org edition includes custom SMTP, a send log, sender name, a weekly report, and a test email. There is no license key.
Microsoft 365 / Outlook and Google / Gmail connections (including OAuth) are available in the PRO version at icomm.market. This WordPress.org package is complete for custom SMTP.