Mail-Queue(1).pdf

Linux Mail−Queue mini−HOWTO

Table of Contents

Linux Mail−Queue mini−HOWTO. ..................................................................................................................1

Leif Erlingsson, leif@lege.com, Jan P Tietze, jptietze@mail.hh.provi.de. .............................................1

1. Introduction. .........................................................................................................................................1

2. NON dial−on−demand solutions PART. .............................................................................................1

3. Dial−on−demand solutions PART. ......................................................................................................1

4. Delivering e−mail. ...............................................................................................................................1

5. License. ................................................................................................................................................1

1. Introduction. .........................................................................................................................................1

2. NON dial−on−demand solutions PART. .............................................................................................1

2.1 Starting sendmail. ..............................................................................................................................2

2.2 Configuring sendmail. .......................................................................................................................2

Configuring sendmail.cf directly, for trivial configurations. ......................................................2

Configuring sendmail.cf using m4 source. .................................................................................3

2.3 Menu support suggestions .................................................................................................................4

3. Dial−on−demand solutions PART. ......................................................................................................4

3.1 Configuring sendmail.cf. ...................................................................................................................4

Configuring sendmail.cf directly, for trivial configurations. ......................................................5

Configuring sendmail.cf using the m4 source.. ..........................................................................5

3.2 Adding dial delay. ..............................................................................................................................5

Configuring sendmail.cf directly. ...............................................................................................5

Configuring sendmail.cf using m4 source. .................................................................................6

4. Delivering e−mail. ...............................................................................................................................6

4.1 How to have e−mail delivered at special times.. ...............................................................................6

5. License. ................................................................................................................................................7

Linux Mail−Queue mini−HOWTO

Leif Erlingsson, leif@lege.com , Jan P Tietze,

jptietze@mail.hh.provi.de

v2.03, 2001−12−17, sendmail 8.8.7

Queue Remote Mail + Deliver Local Mail The Configuration Changes Neccessary to Make Sendmail Deliver

Local Mail ***Now*** While Stashing Remote Mail in The Queue Until "I Say So".

1. Introduction

2. NON dial−on−demand solutions PART

· 2.2 Configuring sendmail

2.1 Starting sendmail

· 2.3 Menu support suggestions

3. Dial−on−demand solutions PART

· 3.2 Adding dial delay

3.1 Configuring sendmail.cf

4. Delivering e−mail

4.1 How to have e−mail delivered at special times.

5. License

1. Introduction

The document is written by two authors. The NON dial−on−demand solutions part (oldest part) is written by

Leif Erlingsson <leif@lege.com>, and the newer dial−on−demand solutions part is written by Jan P Tietze

<jptietze@mail.hh.provi.de>.

2. NON dial−on−demand solutions PART

Written by Leif Erlingsson <leif@lege.com>.

The original version of this part contained a lot of unnecessary stuff. This is all it takes, really...

Linux Mail−Queue mini−HOWTO

Linux Mail−Queue mini−HOWTO

2.1 Starting sendmail

Slackware et al: /etc/rc.d/rc.M:

echo "Starting sendmail daemon (/usr/sbin/sendmail −bd −os) [queue only mode]..."

/usr/sbin/sendmail −bd −os # NOT "−bd −q 15m", the "standard" flags!

RedHat et al: /etc/rc.d/init.d/sendmail.init:

echo −n "Starting sendmail: [queue only mode]"

daemon sendmail −bd −os # NOT daemon sendmail −bd −q1h

The −os is not really essential, all it does is this:

SuperSafe [s] Be super−safe when running things, i.e.,

always instantiate the queue file, even if

you are going to attempt immediate delivery.

Sendmail always instantiates the queue file

before returning control the client under

any circumstances. This should really

always be set.

This should already be configured in the default sendmail.cf anyway.

2.2 Configuring sendmail

Serious sendmail users use the m4 source for this. I recommend this solution if you ever plan on upgrading

sendmail and also make anything but trivial changes to sendmail.cf.

If you never intend to fix sendmail so envelope return headers et al works even though you might be on

dynamic dial in IP or something, then you may not need to get the m4 source.

Configuring sendmail.cf directly, for trivial configurations

This way of doing things is extremeley version dependent vs. sendmail.cf versions. The following solution is

*only* valid for sendmail−8.8.x.

Edit /etc/sendmail.cf:

# avoid connecting to "expensive" mailers on initial submission?

O HoldExpensive=True

... later ...

##### @(#)smtp.m4 8.33 (Berkeley) 7/9/96 #####

Msmtp, P=[IPC], F=mDFMuXe, S=11/31, R=21, E=\r\n, L=990,

T=DNS/RFC822/SMTP,

A=IPC $h

Mesmtp, P=[IPC], F=mDFMuXae, S=11/31, R=21, E=\r\n, L=990,

T=DNS/RFC822/SMTP,

A=IPC $h

Msmtp8, P=[IPC], F=mDFMuX8e, S=11/31, R=21, E=\r\n, L=990,

T=DNS/RFC822/SMTP,

2.1 Starting sendmail

Linux Mail−Queue mini−HOWTO

A=IPC $h

Mrelay, P=[IPC], F=mDFMuXa8e, S=11/31, R=61, E=\r\n, L=2040,

T=DNS/RFC822/SMTP,

A=IPC $h

The important flag above is ``e''. Don't fuss if the other flags look different in your file. Keep your flags as−is,

only add ``e'' to your flags according to the above examples, unless it's there already. ``e'' marks the mailers

as ``expensive''.

Configuring sendmail.cf using m4 source

In the following I will, for simplicity, assume that the sendmail version is 8.8.7. If you have a different

version, replace 8.8.7 with that version number below! Also, the instructions will not work for older versions

of sendmail. Get the latest sendmail!

Download the sendmail source. Try ``http://WWW.Sendmail.ORG'' or possibly ``ftp.sendmail.org''.

I also recommend that you obtain my patch for allowing envelope sender reverse aliasing and other nice stuff

to really make you take control over your mail environment.

Write to ``Sendmail Patch <sendmail@lege.com>'', Subject: ``sendmail−8.8.7'', if 8.8.7 is your sendmail

version.

They are also available from ``http://www.lege.com'', as is the sgml source of this mini−HOWTO!

You don't have to get my patches in order to get ``Queue Remote Mail + Deliver Local Mail'' to work. My

patches solve other things. But I just thought this would be a nice place to mention them, as many Linux

users will find them extremely useful. (They will even give you properly working virtual domains, if you

like. The virtual domains don't have to be ``local''. They will give you ``xaliases'', or in other words ``reverse

aliasing''.)

Unpack the sendmail source. You may get /usr/src/sendmail−8.8.7/. cd /usr/src/sendmail−8.8.7/cf

Now overlay my patch, if you want it, otherwise skip this step: If you don't want to use procmail as Local

Delivery Agent, save away your /usr/src/sendmail−8.8.7/cf/ostype/linux.m4 before doing this... Save my

patch to ``/tmp/sendmail−8.8.7−cf−cpio−idcmu.gz'', then...

cd /usr/src/sendmail−8.8.7/cf

gzip −dc < /tmp/sendmail−8.8.7−cf−cpio−idcmu.gz | cpio −idcmu

If you didn't want to use procmail, write back the saved copy of /usr/src/sendmail−8.8.7/cf/ostype/linux.m4

again.

And regardless of if you applied my patch or not, you must make sure these lines or very similar ones are

added to /usr/src/sendmail−8.8.7/cf/cf/yourhostname.smtp.mc (but if you applied my patch you may want to

investigate filenames containing the word ``elijah'', under /usr/src/sendmail−8.8.7/cf):

dnl # Defer Delivery to "expensive" mailers until next time the

dnl # queue is processed using "O HoldExpensive=True" and make

dnl # sure smtp mailers are "expensive".

dnl # (See original "sendmail" book Chapter 30: Options,

dnl # "Oc − Don't connect to expensive mailers", or

dnl # 2nd Edition "sendmail" book Chapter 34.8.29,

Configuring sendmail.cf using m4 source

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