VPN client can only telnet to mail server via the external address

Currently we have a mail server sitting on and we have the following static nat

ip nat inside source static 25 (external ip) 25 extendable

This works fine, however vpn client connections can only telnet to port

25 on the mail server by telneting to the external ip port 25 which port forwards to the mail server as per static nat.

Is there a command i could configure so the vpn client can telnet directly onto port 25 of the mail server internally? so i can issue the command telnet 25

The clients are using an address pool assigned by the router.

They can telnet to 110 (pop3) etc but not 25 (smtp)

Any help would be greatly appreciated as its driving me crazy slowly

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