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|
-----
ESMTP
-----
José Fonseca
---
July 2003
Introduction
~~~~~~~~~~~~
<<esmtp>> is a user configurable relay-only Mail Transfer Agent (MTA) with a
<<sendmail>> compatible syntax. It's based on <<libESMTP>> supporting the
AUTH (including the CRAM-MD5 and NTLM SASL mechanisms) and the StartTLS SMTP
extensions.
See the {{{http://esmtp.sourceforge.net/}ESMTP home page}} for updated
information.
Configuration
~~~~~~~~~~~~~
* Sample configuration file
~~~~~~~~~~~~~~~~~~~~~~~~~~~
This is a simple configuration file for a quick start:
--------------------------------------
hostname = mail.myisp.com:25
username = "myusername"
password = "mysecret"
starttls = enabled
identity = myself@somewhere.com
hostname = smtp.somewhere.com:25
username = "myself"
password = "secret"
starttls = enabled
mda "/usr/bin/procmail -d %T"
--------------------------------------
* Configuration options
~~~~~~~~~~~~~~~~~~~~~~~
See the <<esmtprc>> man page for more detailed information on the
configuration options.
Invocation
~~~~~~~~~~
<<esmtp>> is command line compatible with <<sendmail>>.
See the <<esmtp>> man page for information on how to invoke it.
Interfacing to Mail User Agents
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Most Mail User Agents (MUAs) will work without need to configuration provided
that you install a symbolic from <<</usr/sbin/sendmail>>> to the esmtp
executable. This should already be taken care of by the <install> target of
the makefile when building from source.
If by any reason it is not possible to have (such as no administrator
privileges or the use of another MTA for local delivery) then you will have
to reconfigure your MUA to use the esmtp executable instead.
* Mutt
~~~~~~
If not using a symbolic link to the esmtp executable you can make <<Mutt>> use
<<esmtp>> by adding the following line to your <<<~/.muttrc>>>:
-----------------------------
set sendmail="/path/to/esmtp"
-----------------------------
<<Esmtp>> supports <<sendmail>> envelope sender <-f> flag, and you are
advised to always enable it by adding the following line to <<Mutt>>
configuration file:
---------------------
set envelope_from=yes
---------------------
For debugging purposes you may prefer to put in your <<<~/.muttrc>>>:
--------------------------------------------------
set sendmail="/path/to/esmtp -v -X /tmp/esmtp.log"
--------------------------------------------------
This will enable verbose output and logging of the traffic with the SMTP
server.
Interfacing to Mail Delivery Agents
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
<<esmtp>> relies upon a Mail Delivery Agent (MDA) for local mail delivery, so
you need one if you want to avoid having another MTA for local delivery.
Notice that at the moment <<esmtp>> does not honor mail aliases or
<<<.forward>>> files.
To deliver to other users beside yourself, the MDA must be installed with
<setuid> flag -- which is done by default in most Linux distributions.
* Procmail
~~~~~~~~~~
To use <<procmail>> with <<esmtp>> set the <<<mda>>> configuration value to:
-----------------------------
mda="/usr/bin/procmail -d %T"
-----------------------------
Interfacing with other mail applications
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
* Fetchmail
~~~~~~~~~~~
By default <<fetchmail>> delivers messages via SMTP to port 25 on the machine
it is running. Because <<esmtp>> has no SMTP server if you are not using another
MTA for local delivery then you will need to configure <<fetchmail>> to use
<<esmtp>> executable. This is accomplished by adding the following lines to the top
of your <<<~/.fetchmailrc>>>:
-------------------------------------
defaults
mda "/path/to/esmtp -f %F %T"
-------------------------------------
Since <<esmtp>> simply forwards the mail to another MDA you can avoid this
redundant step by simply replacing the value inside the quotes above by
whichever value you use on your <<<~/.esmtprc>>>.
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