11-14-2000
Yes, maybe. Most UNIX-based mail utilites have ways to change this. What is the exact name of the mail utility you are using or planning to use and the platform? Some are more flexible than others. I know you can do this with both sendmail() and elm(). Not sure about mail.
Here is part of the man page for mailx on linux (mail):
Quote:
MAIL(1) System Reference Manual MAIL(1)
NAME
mail - send and receive mail
SYNOPSIS
mail [-iInv] [-s subject] [-c cc-addr] [-b bcc-addr] to-addr...
mail [-iInNv] -f [name]
mail [-iInNv] [-u user]
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LEARN ABOUT XFREE86
socketmap_table
SOCKETMAP_TABLE(5) File Formats Manual SOCKETMAP_TABLE(5)
NAME
socketmap_table - Postfix socketmap table lookup client
SYNOPSIS
postmap -q "string" socketmap:inet:host:port:name
postmap -q "string" socketmap:unix:pathname:name
postmap -q - socketmap:inet:host:port:name <inputfile
postmap -q - socketmap:unix:pathname:name <inputfile
DESCRIPTION
The Postfix mail system uses optional tables for address rewriting. mail routing or policy lookup.
The Postfix socketmap client expects TCP endpoint names of the form inet:host:port:name, or UNIX-domain endpoints of the form unix:path-
name:name. In both cases, name specifies the name field in a socketmap client request (see "REQUEST FORMAT" below).
PROTOCOL
Socketmaps use a simple protocol: the client sends one request, and the server sends one reply. Each request and each reply are sent as
one netstring object.
REQUEST FORMAT
The socketmap protocol supports only the lookup request. The request has the following form:
name <space> key
Search the named socketmap for the specified key.
Postfix will not generate partial search keys such as domain names without one or more subdomains, network addresses without one or more
least-significant octets, or email addresses without the localpart, address extension or domain portion. This behavior is also found with
cidr:, pcre:, and regexp: tables.
REPLY FORMAT
The Postfix socketmap client requires that replies are not longer than 100000 characters (not including the netstring encapsulation).
Replies must have the following form:
OK <space> data
The requested data was found.
NOTFOUND <space>
The requested data was not found.
TEMP <space> reason
TIMEOUT <space> reason
PERM <space> reason
The request failed. The reason, if non-empty, is descriptive text.
SECURITY
This map cannot be used for security-sensitive information,
because neither the connection nor the server are authenticated.
SEE ALSO
http://cr.yp.to/proto/netstrings.txt, netstring definition
postconf(1), Postfix supported lookup tables
postmap(1), Postfix lookup table manager
regexp_table(5), format of regular expression tables
pcre_table(5), format of PCRE tables
cidr_table(5), format of CIDR tables
README FILES
Use "postconf readme_directory" or "postconf html_directory" to locate this information.
DATABASE_README, Postfix lookup table overview
BUGS
The protocol limits are not yet configurable.
LICENSE
The Secure Mailer license must be distributed with this software.
HISTORY
Socketmap support was introduced with Postfix version 2.10.
AUTHOR(S)
Wietse Venema
IBM T.J. Watson Research
P.O. Box 704
Yorktown Heights, NY 10598, USA
Wietse Venema
Google, Inc.
111 8th Avenue
New York, NY 10011, USA
SOCKETMAP_TABLE(5)