SMTP Dialog is a simple application to test SMTP connections. In comparison to a raw telnet to port 25, this application lets you test secure SMTP (TLS) and authentication.

Options:
1. Secure SMTP with STARTTLS
2. SMTP Authentication LOGIN or NTLM, the Configure includes Authentication Credentials (Domain, User and Password).
3. HELO or EHLO (domain)
4. MAIL FROM (email address)
5. RCPT TO (email address)
6. DATA (body must end with a line containing only "." and tow newlines)

The license of this software is Free, you can free download and free use this email tool software.