How to prevent cleartext logins to POP and SMTP?

Refers to:

  • Plesk 12.0 for Linux

Created:

2016-11-16 13:12:33 UTC

Modified:

2016-12-21 20:11:45 UTC

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How to prevent cleartext logins to POP and SMTP?

Question

How to prevent clear text logins to POP and SMTP?

Answer

Remove LOGIN string in the following line at /etc/courier-imap/pop3d file

POP3AUTH="CRAM-MD5 CRAM-SHA1 CRAM-SHA256"

If qmail is used, this is recommended to switch to postfix. Forcing secure connection over SMTP in qmail requires patching. Qmail entered extended support .

Add the following line in postfix config /etc/postfix/main.cf

smtpd_tls_auth_only=yes
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