Sp00fer blog post -
A tool to verify electronic mail addresses using SMTP
A script to connect to a SMTP server and send email using that.
A secure, interactive PowerShell tool for systems administrators to validate Office365 SMTP configurations, test credentials (including App Passwords), and troubleshoot email delivery issues without hardcoding sensitive data.
Various tools for setting up and testing Exim4 mail server
A standalone, single-file PHP server to test standard SMTP and AWS SES (IAM Keys) connections
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