Sendmail: Theory and Practice, Second Edition
A comprehensive guide to the nooks and crannies of Sendmail, the most-popular electronic mail utility for those using Unix-based servers.
TABLE OF CONTENTS Sendmail: Theory and Practice, Second Edition
Appendix E: Internal Macro Names
The following macros [1] are defined and/or used internally by Sendmail for interpolation into argv's for mailers or for other contexts.
The ones marked are information passed into sendmail [2], the ones marked are information passed both in and out of sendmail, and the unmarked macros are passed out of sendmail but are not otherwise used internally. These macros are:
| $a | The origination date in RFC 822 format. This is extracted from the Date: line. |
| $b | The current date in RFC 822 format. |
| $c | The hop count. This is a count of the number of Received: lines plus the value of the -h command line flag. |
| $d | The current date in UNIX (ctime) format. |
| $e | (Obsolete; use SmtpGreetingMessage option instead.) The SMTP entry message. This is printed out when SMTP starts up. The first word must be the $j macro as specified by RFC821. Defaults to $j Sendmail $v ready at $b. Commonly redefined to include the configuration version number, e.g., $j Sendmail $v/$Z ready at $b |
| $f | The envelope sender (from) address. |
| $g | The sender address relative to the recipient. For example, if $f is foo, $g will be host!foo, foo@host.domain, or whatever is appropriate for the receiving mailer. |
| $h | The recipient host. This is set in ruleset 0 from the $@ field of a parsed address. |
| $i | The queue id, e.g., HAA12345. |
| $j | The "official" domain name for this site. This is fully qualified if the... |
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