Installing GFI MailSecurity in gateway 

mode 

Introduction to installing in SMTP gateway mode 

This chapter explains the procedure how to install and configure GFI 

MailSecurity in SMTP gateway mode. There are 2 ways to install GFI 

MailSecurity in SMTP gateway mode: 

1.  On the Exchange Server 2000/2003 machine. 

2.  On a separate machine at the perimeter of your network. 

If you are installing on the Exchange Server 2000/2003 machine, set 

up is very straight forward. Simply choose gateway mode rather then 

VS API mode.  

If installing on a separate server, you must configure that machine to 

act as a gateway for all mail first. This set up is also known as  Smart 

host   or   Mail  relay   server.  Once  configured,  you  can  install  GFI 

MailSecurity on that machine. 

In  SMTP  gateway  mode,  GFI  MailSecurity  checks  inbound  and 

outbound  mail  before  it  reaches  your  mail  server.  For  more 

information  about  GFI  MailSecurity  operating  modes  and  the  SMTP 

gateway mode, please see the chapter `Explaining GFI MailSecurity'. 

SMTP  gateway  mode  is  the  correct  mode  if  you  run  Exchange 

5.5, Lotus Notes or another SMTP/POP3 server!  

If you are running a Windows NT network: The machine running 

GFI  MailSecurity  can  be  totally  separate  from  your  Windows  NT 

network   GFI MailSecurity does not require Active Directory! 

Installing GFI MailSecurity in front of your firewall 

A  good  way  to  deploy  GFI  MailSecurity  is  to  install  it  on  a  separate 

machine  in  front  of  your  firewall  or  on  your  firewall  (if  running  a 

Windows  2000/2003  firewall  such  as  Microsoft  ISA  Server).  This 

allows you to keep your corporate mail server behind the firewall. GFI 

MailSecurity will act as a smart host/mail relay server in the perimeter 

network (also known as DMZ   demilitarized zone). 

Additional advantages are: 

  You can perform maintenance on your Mail server machine, whilst 

still receiving email from the Internet. 

  You use less resources on your Mail server machine 

  The  GFI  MailSecurity  machine  can  have  a  lower  spec  then  the 

Mail server machine and process mail faster. 

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