HP-UX Mailing Services Administrator's Guide (B2355-91064)

Table of Contents
About This Document...................................................................................................................13
New and Changed Information in This Edition........................................................................13
Intended Audience................................................................................................................13
HP-UX Release Name and Release Identifier...........................................................................14
Publishing History.................................................................................................................14
Document Organization.........................................................................................................14
Related Information...............................................................................................................15
Typographical Conventions....................................................................................................15
HP Welcomes Your Comments...............................................................................................16
1 Mailing Services Overview........................................................................................................17
The elm Utility.......................................................................................................................18
How elm Works...............................................................................................................18
The elm Configuration File................................................................................................18
The mailx Utility....................................................................................................................19
The mail/rmail Utility.............................................................................................................21
The Sendmail Utility..............................................................................................................22
Message Structure............................................................................................................23
How Sendmail Collects Messages......................................................................................24
How Sendmail Routes Messages........................................................................................24
Default Routing Configuration.....................................................................................26
Local Addresses:....................................................................................................26
UUCP Addresses:..................................................................................................26
SMTP Addresses:...................................................................................................27
Mixed Addresses:..................................................................................................27
Mail Exchanger (MX) Records......................................................................................27
MX Failures:..........................................................................................................29
Defining Queue Groups....................................................................................................29
The Default Queue Group............................................................................................29
The Q Configuration Command...................................................................................30
Using queuegroups Through the access Database..........................................................31
Queue Group Limitations............................................................................................31
Connection Caching....................................................................................................31
How Sendmail Improves Mail Queue Performance.............................................................32
Default Client/Server Operation........................................................................................33
How Sendmail Handles Errors..........................................................................................34
How Sendmail Handles Permanent Failures.................................................................34
How Sendmail Handles Temporary Failures.................................................................35
Table of Contents 3