sendmail -bv Boon_Poh_Chua@ap.irco.com
This should tell you if the address is deliverable.
Otherwise open two sessions to your server
In the first do
tail -f /var/adm/syslog/mail.log
This will scroll as mail related messages appear.
In the 2nd window
echo "this is a test" | mailx -s "testing" Boon_Poh_Chua@ap.irco.com
When you press enter in the 2nd window look at the 1st window and see if see any error messages.
If there are too many messages in mail.log you can filter the tail -f command
Example:
tail -f /var/adm/syslog/mail.log | grep ap.irco.com
This will show only emails with ap.irco.com as part of the message or the To/From fields.
You can filter it further by using Boon_Poh_Chua@ap.irco.com instead of ap.irco.com. But you may miss some information.
Make sure sendmail is running
ps -ef | grep -i sendmail
Make sure mail isn't stuck
mailq
If you see lots of mail in the queue then check your DNS (resolv.conf etc)
The Devil is in the detail.
