SMTP Test Tool

Test your connection to Sendgrid, Mailgun, Amazon SES, or any SMTP server. See the exact SMTP "conversation" to help you troubleshoot email issues. FAQ.

Need a different SMTP service? Here's my technical review of popular SMTP services.

Find out why GMass is the most popular Gmail mail merge tool in the world

Easy to learn. Easy to use. Packed with time saving, email enhancing features.

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GMass requires Chrome Then check out the quickstart guide to send your first mail merge email in minutes!

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