[SOLVED] How to restrict users to send mail to outside domains
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You can put a non-existent host in the smtproutes file, so when qmail tries to deliver a message that is not local it fails with a "permanent error"
You may also use queuelifetime to specify the time (e.g. 600) that the message stays in queue before it bounces back (default is 1 week)
You don't pay much attention to replies.
I've already told you, that you need to specify a small amount time in /var/qmail/control/queuelifetime, so yo don't have to wait a week to get the bounce back message.
I don't know what you did, but I've just tested with a queuelifetime of 60sec and it worked, as you can see:
2011-06-11 11:10:26.242030500 new msg 4793211
2011-06-11 11:10:26.242033500 info msg 4793211: bytes 510 from <email@example.com> qp 2867 uid 1000
2011-06-11 11:10:26.294100500 starting delivery 32: msg 4793211 to remote XXXXX@gmail.com
2011-06-11 11:10:26.294102500 status: local 0/10 remote 1/20
2011-06-11 11:10:29.301976500 delivery 32: deferral: Sorry,_I_wasn't_able_to_establish_an_SMTP_connection._(#4.4.1)/
2011-06-11 11:10:29.301979500 status: local 0/10 remote 0/20
2011-06-11 11:17:07.348944500 starting delivery 33: msg 4793211 to remote XXXXX@gmail.com
2011-06-11 11:17:07.348947500 status: local 0/10 remote 1/20
2011-06-11 11:17:10.358305500 delivery 33: failure: Sorry,_I_wasn't_able_to_establish_an_SMTP_connection._(#4.4.1)/I'm_not_going_to_try_again;_this_message_has_been_in_the_queue_too_long./
2011-06-11 11:17:10.358309500 status: local 0/10 remote 0/20
2011-06-11 11:17:10.473097500 bounce msg 4793211 qp 2911
2011-06-11 11:17:10.473100500 end msg 4793211
2011-06-11 11:17:10.473648500 new msg 4793225
2011-06-11 11:17:10.473650500 info msg 4793225: bytes 1146 from <> qp 2911 uid 1008
2011-06-11 11:17:10.540737500 starting delivery 34: msg 4793225 to local firstname.lastname@example.org
2011-06-11 11:17:10.540740500 status: local 1/10 remote 0/20
2011-06-11 11:17:21.034665500 delivery 34: success: did_1+0+1/
2011-06-11 11:17:21.034668500 status: local 0/10 remote 0/20
2011-06-11 11:17:21.035031500 end msg 4793225
AFAIK qmail tries for the first time to send the message and then retries (every 5mins?) until the queuelifetime expires. Then tries for a last time and bounces back the mail.
Even though there is no need to restart qmail, try to restart it and test to see what happens
i kept 200 in /var/qmail/control/queuelifetime, and restart but still not get bounce back i will baunce back after 1 week which is default values i think qmail not take value from queuelifetime need to edit any other files??