Cannot send E-mail to domains NOT on server....

This is a strange problem. I've thought about it for a bit, but can't seem to figure it out. Here goes:

Server is on network A.

E-mail client is on network B.

If I send e-mail from client on B, the e-mail will never get sent.

If I send e-mail from webmail client on network A, e-mail gets sent out.

dig from network B shows that everything is in order as far as DNS... as far as I can tell, anyway...

C:\WINDOWS\system32>dig MX windsorhost.com

; <<>> DiG 9.2.2 <<>> MX windsorhost.com
;; global options: printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 41
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 2, ADDITIONAL: 4

;; QUESTION SECTION:
;windsorhost.com. IN MX

;; ANSWER SECTION:
windsorhost.com. 8337 IN MX 0 windsorhost.com.

;; AUTHORITY SECTION:
windsorhost.com. 8337 IN NS ns2.windsorhost.com.
windsorhost.com. 8337 IN NS ns.windsorhost.com.

;; ADDITIONAL SECTION:
windsorhost.com. 7785 IN A 69.57.173.50
ns.windsorhost.com. 8138 IN A 69.57.173.50
ns.windsorhost.com. 8138 IN A 69.57.173.51
ns2.windsorhost.com. 8118 IN A 69.57.173.50

;; Query time: 110 msec
;; SERVER: 216.106.1.2#53(216.106.1.2)
;; WHEN: Fri Oct 10 12:35:45 2003
;; MSG SIZE rcvd: 148


The only thing I can think of is that ns.windsorhost.com is mentioned with A records TWO TIMES with different IPs. I have fixed that problem.

Otherwise, the IP and DNS configuration is correct.

I do not own these domains, I'm simply trying to fix the problem for a client.

Any hints / suggestions?

Spuds

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