MX pointing to external relay MTA

[stk]

Hi,

I'm currently evaluating ZCS 5.0 FOSS Ed. on CentOS 5.2 i386.

our company has a funny DNS/MX setup where the public MX record
points to another company that does all the spam filtering/etc for us.

any email sent to ourcompany.de is received by other-company.de,
which just forwards any non-spam messages to our internal MTA
which is DNAT'ed to a private subnet( 10.x.x.x ).

I'm curious if zimbra could work in that setup,
I've read the topics about split-dns and faking an internal MX record just for
zimbra and maybe other local machines would be no big deal.

would it be sufficient if we just set the "relayhost" to
"mx0X.other-company.de"
or are there any other things we might need to consider
to get zimbra working for ourcompany.de and some other domains with similar MX records ?

regards

stk

p.s. this is a slightly sanitized public MX record for our company:

# dig ourcompany.de MX

; <<>> DiG 9.3.4-P1 <<>> ourcompany.de MX
;; global options: printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 20497
;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 2, ADDITIONAL: 2

;; QUESTION SECTION:
;ourcompany.de. IN MX

;; ANSWER SECTION:
ourcompany.de. 2777 IN MX 20 mx4.other-company.de.
ourcompany.de. 2777 IN MX 10 mx3.other-company.de.

;; AUTHORITY SECTION:
ourcompany.de. 1536 IN NS ns.namespace4you.de.
ourcompany.de. 1536 IN NS ns2.namespace4you.de.

;; ADDITIONAL SECTION:
ns.namespace4you.de. 85575 IN A 80.67.16.124
ns2.namespace4you.de. 85575 IN A 193.223.77.3

[uxbod]

Welcome to the forums

For ZCS to function correctly on a private IP you will indeed need to setup a Wiki :: Split DNS architecture with a MX and A record for your server.