Hi Kebba, Yes, Exim4U is designed to be used for MX relay domains as well as local domains. If you are using Exim4U on both your primary and relay (secondary MX) servers then spam filtering should be setup to occur on both servers such that whichever (primary or relay) server receives a given email also performs the spam filtering for that given email. The recommended Exim4U setup for relay domains is as follows. You must setup your relay domains on your relay (secondary MX) server within Exim4U's domain administration function (logging in as siteadmin). For each relay domain you must specify the appropriate relay server address (to the primary MX host) within the domain administration function. Then, on the primary installation, add the relay server to /etc/exim/exim4U_backup_mx_host_names which will exempt mail relayed by the backup MX server from spam filtering and ratelimit checks (since the relay server will already have performed spam filtering). Reference the documentation in the following Exim4U files: http://exim4u.org/svn/exim4u_src/trunk/NOTES - Refer to section 3 in the NOTES file. http://exim4u.org/svn/exim4u_src/trunk/etc/exim/exim4u_global_spam_virus - Refer to BACKUP MX SERVERS (OR RELAY SERVERS) CONFIGURATION NOTE. http://exim4u.org/svn/exim4u_src/trunk/etc/exim/exim4u_backup_mx_host_names http://exim4u.org/svn/exim4u_src/trunk/etc/exim/exim4u_backup_mx_rl_host_nam... Note that Exim4U does not rely on DNS MX records for relaying mail from a relay host to its destination host. Instead, the destination host is specified in the Exim4U web interface in the Relay Server Address field in Domain Administration. Therefore, multiple relay hosts may be deployed along with the destination host and the MX records can all be set to the same value or any set of values for that matter but all mail will ultimately be delivered to the destination host. Exim4U is then used to specify whether spam processing, tagging and/or spam header rewriting is done by the relay host(s) or the destination host. These features also provide the capability for Exim4U installations to be used as spam filters for any other mail host. FYI, Gordon On 02/14/2011 11:27 AM, Kebba Foon wrote:
Hi list,
I have two exim4u installation but the mail boxes are only one server, this is done for backup purposes but I advertise both mx on the internet now the secondary server is accepting mails for my domains but can deliver them to any mailboxes as they don’t exist on the second box. So I question is can I turn the second exim4u server to a backup MX? So that it can accept mails for my domains and queue/forward them to the primary(main) mail server. If so can you please send me the sample config file?
Thanks
Kebba
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