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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

YaySMTP – WP SMTP Plugin with Full Email Log & 15+ SMTP Services

Mailvat

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WordPress SMTP Service, Email Delivery Solved! — MailHawk

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HTP SMTP – WP Mail SMTP, Amazon SES, SendGrid, MailGun and Any SMTP Connector Plugin

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