In short the situation explained:
We are a small ISP with a primary emailserver (Imail) and a backup
emailserver (Imail).
All the MX records of our customer domains points to first the primary (MX
5), second the backup
email server (MX 10).
For illustration purposes:
IP address primary mailserver: 15.15.15.15
IP address backup mailserver: 21.21.21.21
We run declude junkmail en virus on the primary emailserver.
On both servers SMTP relay is only possible from certain IP addresses (i.e.
our dial-in users, own other
servers, fixed line customers).
The email for some customers with a own emailserver is also routed through
our primary backup server
so that email will be scanned (virusses and spam).
This is an example for the host file on our primary emailserver:
15.15.15.15 localpop3domain.com
15.15.15.15 anotherlocalpop3domain.com
212.18.15.129 customerwithownemailserver.com
15.15.15.15 againanotherlocalpop3domain.com
On our backup emailserver (configured as gateway host to 15.15.15.15) are no
local configured pop3 domains, only a host file which says
where the email has to be delivered:
15.15.15.15 localpop3domain.com
15.15.15.15 anotherlocalpop3domain.com
15.15.15.15 customerwithownemailserver.com (so that email will be scanned
first on primary server, and then is being send from the primary server to
the customers own mailserver)
15.15.15.15 againanotherlocalpop3domain.com
Due to the above configuration you can send all email to for example
@localpop3domain.com with
all addresses you want to through the backup emailserver, because this
server accepts all
email for this domain. After accepting the email it will be moved on to the
gateway server 15.15.15.15 (primary server).
For a couple of weeks we receive a lot of random email at all our domains
through the backup emailserver. All email is routed
to the primary server which have to generate a mass number of error/bounce
messages because
the invalid address.
We would like to get the best configuration possbile for:
*** 1 primary email server
- relaying mail for own customers based on IP address
- doing virus and spam scanning by using Declude for local POP3 domains
- routing email to customer owned mailserver (scanning spam+virus)
*** 1 backup email server
- only accepting email for valid addresses
- sending email to the primary mailserver when back online again
- sending email to the primary mailserver for scanning virus+spam
Maybe it's advisable to run another copy of Declude Junkmail and Virus on
our backup emailserver?
We would like to have the less possible system load at our primary
emailserver due to the
importance of availabillity for our customers.
Important:
We receive lots of email directly at the backup email server (MX 10) when
the primary emailserver (MX 5) is running normal (with no execeptional
load). How is this possible?
Could someone please help me out to illustrate "the best" scenario?
Thank you all in advance.
Best regards,
Marcel Sangers
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