CritSend Alternatives

AuthSMTP is the outgoing SMTP email service for e-commerce websites, mailing lists or email applications.

SMTP2GO is the scalable, reliable email deliverability solution. Worldwide servers, a robust API, and powerful reporting set us apart. Try our free plan!

Create automated newsletter campaigns with an affordable email marketing solution

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VoloMP is an email marketing platform for high-volume emailers. Ideal for affiliate marketers mailing to 500K+ a day.

Deliver your app and website emails on time and to the inbox. Trusted to send 25% of the world's non-spam email. Email delivery for companies big and small.

Open Source

bounce.io is turning bounced emails into a new user experience, revenue channel and threat intelligence.

Email Validation & Email Verification reduces bounce rates up to 98%. Rapidly verifying email addresses has never been easier, just drag drop and deliver!

Learn why more developers choose SendGrid for their email deliverability service to send transactional emails triggered by web apps. Get started for free

turboSMTP is a reliable, powerful, easy-to-use SMTP server that maximizes the deliverability of all...

SMTP provides scalable affordable email infrastructure for all your sending needs.

Folderly is an all-in-one email deliverability platform to supercharge your email performance. Locate, solve, prevent email deliverability pitfalls, and ensure that your emails reach the Inbox folder.

Open Source paid Free Trial $120.0 / Monthly (Folderly Premium)

Marketing & transactional email delivery platform

Inbox placement solutions from Return Path helps improve email deliverability and increases email marketing ROI.

Warm up your cold email inbox, and never land in spam anymore!

Try for free freemium $9.0 / Monthly