Blocking

Postfix can block attachments. There are two ways to do this, Header and Body checks. We have to edit the main.cf file for postfix.

Step 1

add these two lines to the main.cf

header-checks = regexp:/etc/postfix/headers

body_checks = regexp:/etc/postfix/bodycheck

Step 2 Header Checks

vi /etc/postfix/headers

# dxdx Subject
/dxdx/ DISCARD

This will discard and messge with dxdx in the Subject

example,

Nov 28 13:14:17 it-manage postfix/smtpd[23931]: connect from ispmxmta06-srv.windstream.net[166.102.165.167]
Nov 28 13:14:18 it-manage postfix/smtpd[23931]: 3CC178783B0: client=ispmxmta06-srv.windstream.net[166.102.165.167]
Nov 28 13:14:18 it-manage postfix/cleanup[23935]: 3CC178783B0: discard: header Subject: dxdx from ispmxmta06-srv.windstream.net[166.102.165.167]; from= to= proto=SMTP helo=
Nov 28 13:14:18 it-manage postfix/smtpd[23931]: disconnect from ispmxmta06-srv.windstream.net[166.102.165.167]

Overview:
Enterprise 2003 Server cluster can be a less costly way to have load balancing on Terminal Servers. However, if not network correctly it can cause all sorts of issues. These issues range from server load to the NLB heartbeat. Citrix has a solution, but the cost is a heavy factor. The “bottom line” comes to cost. The question an ASP has to ask: “What will the users pay?”

To Know:
The cluster must have public IP addresses in order for session directory to work correctly. If a user gets disconnected the TS servers must have a public IP in order for the user to get back to their session that is already open. Microsoft has confirmed this in their white papers. Session Directory PDF

Backup email is almost common for companies.

To backup all email for a Postfix server IN and OUT do the following.

vi /etc/postfix/main.cf (Red Hat Linux)
go to bottom of page and add

always_bcc = email address

restart postfix.
This will make all mail sender and recipient have email backup.

This will send all email to the address.

Admins can also use Dovecot and others to run a filtering program to put into folders.
***************************************************************************************

Just a few users for backup.
Adding this to the main.cf will have sender and/or recipient backups.