In this article I will describe how to test the plain and the encrypted SMTP/POP3/IMAP and HTTP protocols with telnet and the openssl s_client command.
list of references
For a complete list of available commands for the used protocols check the RFCs please:
- RFC – Post Office Protocol – Version 3
- RFC – Simple Mail Transfer Protocol
- RFC – INTERNET MESSAGE ACCESS PROTOCOL – VERSION 4rev1
- RFC – Hypertext Transfer Protocol — HTTP/1.1
SMTP sending mail
In the first example I will open a telnet connection to a SMTP Server on …
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