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FluentSMTP – WP SMTP Plugin with Amazon SES, SendGrid, MailGun, Postmark, Google and Any SMTP Provider

SMTP – 100% Free & Open Source SMTP plugin for WordPress – Bit SMTP

GoSMTP – SMTP for WordPress

SMTP for SendGrid – YaySMTP

SMTP for Amazon SES – YaySMTP

Mail Bank – #1 Mail SMTP Plugin for WordPress

WordPress SMTP Service, Email Delivery Solved! — MailHawk

CBX Email SMTP & Logger

Kingmailer WordPress SMTP

SMTP Email Mod by Webwerkstatt Stauß

MailHog for WordPress

Free WP Mail SMTP (Official – 2019)

Easy SMTP – WP Mail SMTP, SendInBlue, SendGrid, MailGun and Any SMTP Connector Plugin