postfix & openbsd & fxp0 & fxp1

[Alex de Joode <usura@zedz.net>]

I have a strange and wierd problem with openbsd & postfix:

  1 machine; 2 networkcards 
fxp0 connects to the lan (a lan which has it's own connection
to the internet @111.12.13.1)

fxp1 connects to an adsl modem.

/etc/hostname.fxp0
inet 111.12.13.21 255.255.255.0 NONE
inet alias 111.12.13.19 255.255.255.255 NONE
inet alias 111.12.13.20 255.255.255.255 NONE

/etc/hostname.fxp1
inet 145.145.145.145 255.255.255.252 NONE

both interfaces work fine, default route for the machine
is via fxp1.

Recently '111.12.13.19' was decommisioned and the services
were moved to '111.12.13.21', www-sites work fine on ther
'111.12.13.19' however postfix doesn't like it.

postfix accepts connection from the outside world on
145.145.145.145 howver it will *only* accept connections
on 111.12.13.{19,20,21} from the 111.12.13.x-LAN.

Any ideas why this is the case ?
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