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== 

• Login Port 25/583

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

• Authenticate

AUTH PLAIN XYZ==
235 2.0.0 OK Authenticated

test

• https://www.checktls.com/
• https://ssl-config.mozilla.org
• https://www.ssllabs.com/ssltest
• http://dkimvalidator.com/
• https://esmtp.email/tools/mta-sts/?#
• https://starttls-everywhere.org
• https://luxsci.com/smtp-tls-checker
• http://multirbl.valli.org/
• https://www.hardenize.com/

Keywords: sasl tls ssl sendmail postfix mta smtp