SMTP
----------------------------------
SMTP configure CSF
# csf.conf
SMTP_BLOCK = "1"
SMTP_ALLOWLOCAL = "1"
SMTP_REDIRECT = "0"
SMTP_PORTS = "25,465,587"
SMTP_ALLOWUSER = ""
SMTP_ALLOWGROUP = "mail,postfix,postdrop,mailman"
SMTPAUTH_RESTRICT = "1"
vi /etc/csf/csf.config
3) Then find the following entries.
To change FTP login failed attempt value.
LF_FTPD = “10”
To change the value failure detection of SMTP AUTH connections.
LF_SMTPAUTH = “5”
To change login failure detection value of courier pop3 connections.
LF_POP3D = “5”
To change login failure detection value of courier imap connections
LF_IMAPD = “10”
To change login failure detection value of cPanel, webmail and WHM connections.
LF_CPANEL = “5”
4) Then save this config file after changing these values.
5) You have to restart csf and lfd services.
csf -r
--------------------