[horde] localhost contact

[Mohsen Pahlevanzadeh]

Dear all,
I have made many domain localy.Same:
Security
quality
BPMS
Even i imported them as a MX record into bind.
Now, when i send via horde from security to another or localy to
localy,I see it is sent to x at security.debian  (debian is my hostname)
i wanna send it to x at security (without my hostname)
It is intresting when i send to yahoo, gmail it can send.
Please help me.....