COMODO Mail Gateway (CMG) could be used for
filtering emails that contains malwares or spam.
 
To integrate with particular mail server CMG has following modes:
- Inner SMTP Filter (Postfix, Exim4)
- Cmdtcpd (AMaViS)
- Qmail
- Milter (Sendmail)
- SMTP Gateway (any MTA)

In mode 'Inner SMTP Filter' CMG can be integrated with Postfix or Exim.
More detailed information are placed in:
 - README.postfix
 - README.exim_template
 - README.exim_split_config
(README.exim_split_config describes how to configure exim
when you use split config files: dc_use_split_config='true').

In mode 'Cmdtcpd' CMG can work as a mail scanner for amavisd-new.
More detailed in README.amavis.

README.qmail describes how integrate CMG with Qmail.

In mode 'Milter' CMG can work as a Milter application with sendmail.
More detailed in README.sendmail.

Mode 'SMTP Gateway' allows integrate CMG with any mail server.
More detailed in README.gateway.

For spam etecting CMG uses Spamassassin.
README.spamassassin contains description about it.

README.certificates describes how use SSL certificates to establish
TLS connection.

README.ip_list describes using of 'IP or Domain list' to restrict access
to CMG in modes 'SMTP Gateway' and 'Inner SMTP Filter'.