............................Contents


1. Understanding Mail Services	1
..Mail Services Terminology	1
....Mail Services Software Terminology	2
........Mail User Agent	2
........Mail Transport Agent	2
........Mail Delivery Agent	2
........Mailers	3
........Domain Names	4
........Mail Address	6
........Mailbox	7
........Aliases	9
....Hardware Components of a Mail Configuration	11
........Mail Host	12
........Mail Server	12
........Mail Client	13


........Mail Gateway	13
....Mail Service Programs and Files	15
........`sendmail` Program	18
........`sendmail` Configuration File	19
........`sendmail` Configuration Table	21
........`.forward` Files	22
..How Mail Addressing Works	23
..Planning Your Mail System	24
....Local Mail Only	25
....Local Mail in Remote Mode	25
....Local Mail and a Remote Connection	26
....Two Domains and a Gateway	27
2. Setting Up and Administering Mail Services	31
..Setting Up Mail Services	31
....Setting Up Mail Security	33
....· How to Set Up a Mail Server	33
....· How to Set Up a Mail Client	34
....· How to Set Up a Mail Host	35
....· How to Set Up a Mail Gateway	36
..Creating Mail Aliases	37
....· How to List the Contents of an NIS+ Aliases Table	41
....· How to Add Aliases to a NIS+ mail_aliases Table From the
.......Command Line	41
....· How to Add Entries by Editing an NIS+ mail_aliases Table
.................................................42


....· How to Change Entries in an NIS+ mail_aliases Table.	43
....· How to Delete Entries From a NIS+ mail_aliases Table	43
....Setting Up NIS mail.aliases Map	43
........· How to Set Up NIS mail.aliases Map	44
....Setting Up Local Mail Aliases Files	44
........· How to Set Up Local Mail Aliases Files	45
....Setting Up DNS Aliases Files	46
........· How to Use DNS with `sendmail`	46
....Setting Up the Postmaster Alias	47
........· How to Create a Separate Mailbox for `postmaster`	47
........· How to Add the `postmaster` Mailbox to the Aliases
.................................................47
..Testing the Mail Configuration	48
....· How to Test the Mail Configuration	48
..Administering the Mail Configuration	49
....Duties of the Postmaster	49
........Mail Queue	49
........Format of Queue Files	50
....· How to Print the Queue	51
....· How to Force the Queue	52
....· How to Run a Subset of the Mail Queue	52
....· How to Move the Queue	52
....· How to Run the Old Mail Queue	53
....System Log	53


..Troubleshooting Tips	55
....· How to Check Aliases	55
....· How to Test the `sendmail` Rule Sets	56
....· How to Verify Connections to Other Systems	57
....Other Diagnostic Information	57
3. Customizing `sendmail` Configuration Files	59
..`sendmail` Overview	60
..`sendmail` Features	60
..`sendmail` Functions	61
....`sendmail` Interfaces	62
........Argument Vector/Exit Status	62
........SMTP Over Pipes	62
........SMTP Over a TCP Connection	62
..How `sendmail` Works	63
........Argument Processing and Address Parsing	63
........Message Collection	63
........Message Delivery	64
.... Error Handling	65
........Queueing for Retransmission	65
........Return to Sender	65
....Message Header Editing	65
....Configuration File	66
..How `sendmail` Is Implemented	66
....Mail to Files and Programs	66


....Configuration Overview	67
........Macros	67
........Header Declarations	67
........Mailer Declarations	67
........Name-Rewriting Rules	68
........Option Setting	68
..Arguments to `sendmail`	68
....Queue Interval	68
....Daemon Mode	69
....Debugging	69
....Trying a Different Configuration File	70
..Tuning Configuration Parameters	70
....Time Values	70
........Queue Interval	71
........Read Timeouts	71
........Message Timeouts	71
....Delivery Mode	72
....Load Limiting	72
....Log Level	73
....File Modes	74
........`setuid`	74
........Temporary File Modes	74
........Should My Alias Database Be Writable?	75
..`sendmail` Configuration File	75


....Purpose of the `sendmail` Configuration File	75
....`sendmail` Configuration File Syntax	77
........`D` and `L` -- Define Macro	77
........`C`, `F`, and `G`--Define Classes	79
........`O`-- Set Option	81
........`P`-- Precedence Definitions	81
........`T`-- Define Trusted Users	81
........`H`-- Define Header	82
....Special Header Lines	82
....`R` and `S`--Rewriting Rules	83
........`M` -- Define Mailer	84
....Address-Rewriting Rules	84
........Special Macros, Conditionals	84
........Special Classes	88
........Left-Hand Side of Address-Rewriting Rules	88
........Solaris Specific Rules	89
........Right-Hand Side of Address Rewriting Rules	89
........Semantics of Rewriting Rule Sets	91
........`error` Mailer	93
........Semantics of Mailer Descriptions	93
....Building a Configuration File	96
........Domains and Policies	96
........How to Proceed	96
........Testing the Rewriting Rules -- the `-bt` Flag	97


...How `sendmail` Interacts With a Name Service	98
......Setting Up `sendmail` Requirements for Name Services	99
...Command-Line Arguments to `sendmail`	102
...Configuration Options to `sendmail`	103
...Mailer Flags	103
A. `sendmail` Configuration File	105
...A Sample `sendmail` Configuration File	105
B. `sendmail` Options	117
...`sendmail` Command-Line Arguments	117
...`sendmail` Configuration Options	119
...Mailer Flags	123
Index	127