08-10-2001
Yes, now that the use of email has matured, a more robust and secure email protocol would be appropriate. However, it is both human nature and the nature of the IETF to 'pave over cowpaths' so there is little chance that SMTP will be redesigned (and actually used) in the next decade. The trends in IT are to modify and tweak broken legacy systems.
So, we are 'stuck with SMTP' for the forseeable future. However, mail can be sent using SMTP quite securely using PGP and other encryption methods. Originating IP addresses can be hidden; or anonymous remailers can be used (or both!!).
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LEARN ABOUT DEBIAN
exim_checkaccess
EXIM_CHECKACCESS(8) System Manager's Manual EXIM_CHECKACCESS(8)
NAME
exim_checkaccess - Check address acceptance from given IP
SYNOPSIS
exim_checkaccess IP-address email@address [more Exim options]
DESCRIPTION
Exim's -bh command line argument allows you to run a fake SMTP session with debugging output, in order to check what Exim is doing when it
is applying policy controls to incoming SMTP mail. However, not everybody is sufficiently familiar with the SMTP protocol to be able to
make full use of -bh, and sometimes you just want to answer the question "Does this address have access?" without bothering with any fur-
ther details.
The exim_checkaccess utility is a 'packaged' version of -bh. It takes two arguments, an IP address and an email address:
exim_checkaccess 10.9.8.7 A.User@a.domain.example
The utility runs a call to Exim with the -bh option, to test whether the given email address would be accepted in a RCPT command in a
TCP/IP connection from the host with the given IP address. The output of the utility is either the word 'accepted', or the SMTP error
response, for example:
Rejected:
550 Relay not permitted
When running this test, the utility uses "<>" as the envelope sender address for the MAIL command, but you can change this by providing
additional options. These are passed directly to the Exim command. For example, to specify that the test is to be run with the sender
address "himself@there.example" you can use:
exim_checkaccess 10.9.8.7 A.User@a.domain.example
-f himself@there.example
Note that these additional Exim command line items must be given after the two mandatory arguments.
BUGS
This manual page needs a major re-work. If somebody knows better groff than us and has more experience in writing manual pages, any patches
would be greatly appreciated.
SEE ALSO
exim(8), /usr/share/doc/exim4-base/
AUTHOR
This manual page was stitched together from spec.txt by Andreas Metzler <ametzler at downhill.at.eu.org>, for the Debian GNU/Linux system
(but may be used by others).
March 26, 2003 EXIM_CHECKACCESS(8)