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''$H'' '''

$H
The mail hub mc configuration

The m4 nullclient feature (FEATURE(nullclient)) causes all mail to be sent to a central hub machine for handling. Part of what it does is to define the mc macro MAIL_HUB: 

define(`MAIL_HUB', `hub')dnl

This also causes $H to be defined as hub. If MAIL_HUB has a value, and if LOCAL_RELAY ($R) does not, all local email is forwarded to hub. If LOCAL_RELAY is defined, it takes precedence over MAIL_HUB for some mail. See Section 4.5.7 for a description of MAIL_HUB and how it interacts with LOCAL_RELAY.

You should never use this macro directly because it might change in a future release of sendmail. Use the MAIL_HUB mc configuration macro instead.



    		Preface
    		Chapter 1. Some Basics
    		Part I: Build and Install
    		Part II: Administration
    		Part III: The Configuration File
    		Chapter 17. Configuration File Overview
    		Chapter 18. The R (Rules) Configuration Command
    		Chapter 19. The S (Rule Sets) Configuration Command
    		Chapter 20. The M (Mail Delivery Agent) Configuration Command
    		Chapter 21. The D (Define a Macro) Configuration Command
    		21.1 Preassigned sendmail Macros
    		21.2 Command-Line Definitions
    		21.3 Configuration-File Definitions
    		21.4 Macro Names
    		21.5 Macro Expansion: $ and $&
    		21.6 Macro Conditionals: $?, $|, and $.
    		21.7 Macros with mc Configuration
    		21.8 Pitfalls
    		21.9 Alphabetized sendmail Macros
    		''$_'' '''
    		''$a'' '''
    		''${addr_type}'' '''
    		''${alg_bits}'' '''
    		''${auth_authen}'' '''
    		''${auth_author}'' '''
    		''${auth_ssf}'' '''
    		''${auth_type}'' '''
    		''$b'' '''
    		''${bodytype}'' '''
    		''$B'' '''
    		''$c'' '''
    		''${cert_issuer}'' '''
    		''${cert_md5}'' '''
    		''${cert_subject}'' '''
    		''${cipher}'' '''
    		''${cipher_bits}'' '''
    		''${client_addr}'' '''
    		'${client_flags}'' ''''
    		''${client_name}'' '''
    		''${client_port}'' '''
    		''${client_resolve}'' '''
    		''${cn_issuer}'' '''
    		''${cn_subject}'' '''
    		''${currHeader}'' '''
    		''$C'' '''
    		''$d'' '''
    		'${daemon_addr}'' ''''
    		'${daemon_family}'' ''''
    		'${daemon_flags}'' ''''
    		'${daemon_info}'' ''''
    		'${daemon_name}'' ''''
    		'${daemon_port}'' ''''
    		'${deliveryMode}'' ''''
    		'${dsn_envid}'' ''''
    		'${dsn_notify}'' ''''
    		'${dsn_ret}'' ''''
    		'$D'' ''''
    		''$e'' '''
    		''${envid}'' '''
    		''$E'' '''
    		''$f'' '''
    		''$F'' '''
    		''$g'' '''
    		''$h'' '''
    		''${hdr_name}'' '''
    		''${hdrlen}'' '''
    		''$H'' '''
    		''$i'' '''
    		''${if_addr}'' '''
    		''${if_addr_out}'' '''
    		''${if_family}'' '''
    		''${if_family_out}'' '''
    		''${if_name}'' '''
    		''${if_name_out}'' '''
    		''$j'' '''
    		''$k'' '''
    		''$l (lowercase L)'' '''
    		''${load_avg}'' '''
    		''$L'' '''
    		''$m'' '''
    		''${mail_addr}'' '''
    		''${mail_host}'' '''
    		''${mail_mailer}'' '''
    		''${msg_size}'' '''
    		''$M'' '''
    		''${MTAHost}'' '''
    		''$n'' '''
    		''${nrcpts}'' '''
    		''${ntries}'' '''
    		''$o'' '''
    		''${opMode}'' '''
    		''$p'' '''
    		''$q'' '''
    		''${queue_interval}'' '''
    		''$r'' '''
    		''${rcpt_addr}'' '''
    		''${rcpt_host}'' '''
    		''${rcpt_mailer}'' '''
    		''$R'' '''
    		''$s'' '''
    		''${sendmailMTACluster}'' '''
    		''${server_addr}'' '''
    		''${server_name}'' '''
    		''$S'' '''
    		''$t'' '''
    		''${tls_version}'' '''
    		''$u'' '''
    		''$U'' '''
    		''$v'' '''
    		''${verify}'' '''
    		''$V'' '''
    		''$w'' '''
    		''$W'' '''
    		''$x'' '''
    		''$X'' '''
    		''$y'' '''
    		''$Y'' '''
    		''$z'' '''
    		''$Z'' '''
    		Chapter 22. The C and F (Class Macro) Configuration Commands
    		Chapter 23. The K (Database-Map) Configuration Command
    		Chapter 24. The O (Options) Configuration Command
    		Chapter 25. The H (Headers) Configuration Command
    		Part IV: Appendixes
    		Bibliography