Tadek’s Blog

I recently wanted to test TLS with SMTP. I followed instructions on and got it to work in less than 30s

In short:

perl -MMIME::Base64 -e 'print encode_base64("\000user\000password")'
openssl s_client -starttls smtp -crlf -connect <ip>:<port>
auth <auth_command>
mail from:<tadek@pietraszek.org>
rcpt to:<tadek@pietraszek.org>
data
...
.

Interestingly, when I tried typing `RCPT` s_client would interpret it as “renegotiate”, which confused me a bit, but you can inhibit it with `–quiet` or type it in lowercase like I did

T.

This entry was posted on Tuesday, December 2nd, 2008 at 3:06 pm and is filed under Linux. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.