To Filter from an MTA Relay to a Backend Message Store

This example filters all mail for spam and viruses from an MTA relay to a backend message store called msg_store1.siroe.com

1. Add a rewrite rule in the imta.cnf file that sends messages to a backend message store host. Example:

   msg_store1.siroe.com   $U@msg_store1.siroe.com

2. Add a channel corresponding to that rewrite rule with the destinationspamfilterXoptin keyword. Example:

   tcp_msg_store1 smtp subdirs 20 backoff "pt5m" "pt10" "pt30" "pt1h" \
   "pt2h" "pt4h" maxjobs 1 pool IMS_POOL fileinto $U+$S@$D \
   destinationspamfilter 1optin spam,virus
   msg_store1.siroe.com

   Example 2. Filter for spam all incoming mail passing through your MTA (Typically, all incoming messages pass through the tcp_local channel):

   tcp_local smtp mx single_sys remotehost inner switchchannel \
   identnonelimited subdirs 20 maxjobs 7 pool SMTP_POOL \
   maytlsserver maysaslserver saslswitchchannel tcp_auth \
   sourcespamfilter1optin spam
   tcp-daemon

   Example 3. Filter all outgoing mail to the Internet passing through your MTA. (Typically, all messages going out to the Internet pass through the tcp_local channel.)

   tcp_local smtp mx single_sys remotehost inner switchchannel \
   identnonelimited subdirs 20 maxjobs 7 pool SMTP_POOL \
   maytlsserver maysaslserver saslswitchchannel tcp_auth \
   destinationspamfilter1optin spam tcp-daemon

   Example 4. Filter all incoming and outgoing mail passing through your MTA:

   tcp_local smtp mx single_sys remotehost inner switchchannel \
   identnonelimited subdirs 20 maxjobs 7 pool SMTP_POOL \
   maytlsserver maysaslserver saslswitchchannel tcp_auth \
   sourcespamfilter1optin spam destinationspamfilter1optin spam
   tcp-daemon

   Example 5. Filter all mail destined to the local message store in a two-tiered system without using user optin:

   ims-ms smtp mx single_sys remotehost inner switchchannel \
   identnonelimited subdirs 20 maxjobs 7 pool SMTP_POOL \
   maytlsserver maysaslserver saslswitchchannel tcp_auth \
   destinationspamfilter1optin spam
   tcp-daemon

   Example 6. Filter all incoming and outgoing mail for spam and viruses (this presumes that your software filters both spam and viruses):

   tcp_local smtp mx single_sys remotehost inner switchchannel \
   identnonelimited subdirs 20 maxjobs 7 pool SMTP_POOL \
   maytlsserver maysaslserver saslswitchchannel tcp_auth \
   destinationspamfilter1optin spam,virus sourcespamfilter1optin \spam,virus 
   tcp-daemon