Mail fails to work when VPN'ed into server

We have a Mac Mini server running OS X Server (Mountain Lion recently upgraded from Snow Leopard Server). We have an external DNS service that points to the router that has a fix IP address, and the server has an internal fixed IP address from the router. We also run DNS on the mini server referencing this internal fixed IP address. Yes, the dreaded split brain.
We run our mail from the server. When a client is outside the local network (coming in from the Internet), incoming and outgoing mail to the server work fine. However, when VPN'ed in or on the local network directly, mail gets iffy, and SMTP never works.
sudo changeip -checkhostname resolves just fine.
I checked for console messages from the client machine, and the closest I could find to a mail message was:
8/15/12 1:34:39.102 PM Mail[282]: [<FQ server name>:636] Could not bind to server: Invalid DN syntax (ID 34)
and
8/15/12 1:34:40.702 PM Mail[282]: [<_LibSasl2SASLClient: 0x7fedd8c6f4e0> mechanism: PLAIN security layer: no] Failed to start the SASL connection
SASL(-1): generic failure:
Password Service log on the server does not yield anything.
Aside from this repeated warning (I'll solve this later) the SMTP logs have nothing interesting:
Aug 15 13:35:00 <FQ server name> postfix/cleanup[67032]: warning: recipient <_mailman> uid falls below minimum allowed: 78 < 501
I know it is probably some sort of DNS weirdness, but I don't know where to look! Server.app has no DNS error logs to look at.
Any help appreciated!

Hi - Is dns lookup set to all clients in Server.app DNS ?
To set logging for dns:
#look for the block below and change info to debug
#Ctrl x then Y then <ret>
#Stop and Start DNS in server.app or $ sudo serveradmin stop dns / $ sudo serveradmin start dns
#log is /Library/Logs/named.log and is available in Console.app
$ sudo nano /etc/named.conf
logging {
          channel "_default_log" {
                    file "/Library/Logs/named.log";
                    severity info;
                    print-time yes;
          category "default" {
                    "_default_log";
Good luck!

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