[Vacation-list] Help, my vacation work but when I use pine to send to a local user, it will not

Anyone, please help me.

My vacation program work fine if outsider people is sending mail to me.
But if I login to the Linux server and use pine or mail to a local user,
it is not working at all. Therefore, if I use a webmail interface to
send to local user, it will not work as well.

Please help and thanks in advance.

Sendmail give me the follow error message.

Jan  2 19:12:42 xserverpro vacation[8100]: vacation: .vacation.db:
Permission denied 
Jan  2 19:12:42 xserverpro sendmail[8099]: g02BCgm08096: to="|vacation
boom", ctl...@mi... (504/504), delay=00:00:00,
xdelay=00:00:00, mailer=prog, pri=60285, dsn=5.3.0, stat=unknown mailer
error 1

This work if outsider send mail to me

an  2 19:09:02 xserverpro sendmail[8032]: g02B92l08032:
from=<tan...@ce...>, size=672, class=0, nrcpts=1,
msgid=<001601c1937d$e26576e0$0c01a8c0@sygw>, proto=ESMTP, daemon=MTA,
relay=dtcimfe1.celcom.net.my [203.82.64.150]
Jan  2 19:09:02 xserverpro sendmail[8035]: g02B92I08035: from=boom,
size=249, class=0, nrcpts=1,
msgid=<200...@xs...>,
relay=root@localhost
Jan  2 19:09:02 xserverpro sendmail[8033]: g02B92l08032: to="|vacation
boom", ctladdr=<bo...@mi...> (504/504), delay=00:00:00,
xdelay=00:00:00, mailer=prog, pri=60018, dsn=2.0.0, stat=Sent
Jan  2 19:09:02 xserverpro sendmail[8033]: g02B92l08032: to=\boom,
delay=00:00:00, xdelay=00:00:00, mailer=local, pri=60018, dsn=2.0.0,
stat=Sent
Jan  2 19:09:03 xserverpro sendmail[8038]: g02B92I08035:
to=...@ce..., ctladdr=boom (504/504), delay=00:00:01,
xdelay=00:00:01, mailer=esmtp, pri=30249, relay=celmel1.celcom.net.my.
[203.82.64.150], dsn=2.0.0, stat=Sent (Message received:
200...@xs...)