Installing and Administering Internet Services

60 Chapter2

Installing and Conﬁguring Internet Services

Troubleshooting sendmail

This section describes the following techniques for troubleshooting

sendmail:

• “Keeping the Aliases Database Up to Date” on page 60

• “Verifying Address Resolution and Aliasing” on page 60

• “Verifying Message Delivery” on page 61

• “Contacting the sendmail Daemon to Verify Connectivity” on page 62

• “Setting Your Domain Name” on page 63

• “Attempting to Start Multiple sendmail Daemons” on page 63

• “Conﬁguring and Reading the sendmail Log” on page 64

• “Printing and Reading the Mail Queue” on page 67

Almost all sendmail troubleshooting must be done as superuser.

Keeping the Aliases Database Up to Date

The aliases database must be rebuilt if changes have been made to the

aliases text ﬁle.

You must restart sendmail after you change the conﬁguration ﬁle or the

aliases database.

Issue the following commands on a standalone system or on the mail

server to rebuild the aliases database and restart sendmail:

/sbin/init.d/sendmail stop

/sbin/init.d/sendmail start

Updating Your NIS or NIS+ Aliases Database

If you are using NIS or NIS+ to manage your aliases database, see

Installing and Administering NFS Services.

Verifying Address Resolution and Aliasing

In order to deliver a message, sendmail must ﬁrst resolve the recipient

addresses appropriately. To determine how sendmail would route mail