Testing MTA

Imap Test

• Encrypted login

openssl s_client -crlf -connect mail.server.com:993
 
a1 LOGIN username password

SMTP Test

• Get logon credentilas

echo -ne '\0USERNMAE\0PASSWORD' | base64
XYZ== 
root@vm-auto:~# openssl s_client -connect relayhost.example.com:25 -starttls smtp
#-OR-
root@vm-auto:~# openssl s_client -connect relayhost.example.com:587 -starttls smtp

• Login Port 25/583

root@vm-auto:~# openssl s_client -connect mail.mailtower.de:25 -starttls smtp
#-OR-
root@vm-auto:~# openssl s_client -connect mail.mailtower.de:583 -starttls smtp

• Authenticate

AUTH PLAIN XYZ==
235 2.0.0 OK Authenticated