Shadow page

shadowpage.ydns.eu

start Login

Postfix Mail Server

Postfix on RasbPi
Source: Sam Hobbs
postfix
```
sudo apt-get install postfix
```
y for continue
at the menu select: "Internet Site"
"Tab" to "OK" and "Enter" Set the mail name to your domain name (without www):
```
shadow.my-wan.de
```
change directory
```
cd /etc/postfix/
```
```
sudo nano /etc/postfix/main.cf
```
add
```
inet_protocols = ipv4
```
Check if
```
myhostname =
```
has the correct hostname
restart postfix
```
sudo service postfix restart
```
make backups of the important files:
```
sudo cp main.cf main.cf.BAK
sudo cp master.cf master.cf.BAK
```

Mailbox Setup

sudo nano /etc/postfix/main.cf
#mailbox_size_limit = 0
home_mailbox = Maildir/
mailbox_command =

Dovecot

sudo apt-get install dovecot-common dovecot-imapd

Create amil folders

sudo maildirmake.dovecot /etc/skel/Maildir
sudo maildirmake.dovecot /etc/skel/Maildir/.Drafts
sudo maildirmake.dovecot /etc/skel/Maildir/.Sent
sudo maildirmake.dovecot /etc/skel/Maildir/.Spam
sudo maildirmake.dovecot /etc/skel/Maildir/.Trash
sudo maildirmake.dovecot /etc/skel/Maildir/.Templates

copy files to user

sudo cp -r /etc/skel/Maildir /home/USER/
sudo chown -R USER:USER /home/USER/Maildir
sudo chmod -R 700 /home/USER/Maildir

for user pi:

sudo cp -r /etc/skel/Maildir /home/pi/
sudo chown -R pi:pi /home/pi/Maildir
sudo chmod -R 700 /home/pi/Maildir

Initial Testing

First, install telnet:

sudo apt-get install telnet

telnet localhost 25

You can now test sending an email using SMTP. Here are the steps:

send an ehlo command to tell the server who you are, and it will tell you its capabilities
use the mail from command to say who the email is from. If you are sending it from an address that exists on the server, you needn’t include the domain name (i.e. user instead of user@yourdomain.com)
use the rcpt to command to tell the server where to send the email
Use the data command to tell the server that you’re about to start giving it the message you want to send
Type Subject: YOUR SUBJECT then enter to set a subject
Type the body of your email. Once you’re done, press ENTER, then ., then ENTER again.
Type quit to exit

Here’s an example:

telnet localhost 25
Trying 127.0.0.1...
Connected to localhost.
Escape character is '^]'.
220 shadow.my-wan.de ESMTP Postfix (Debian/GNU)
ehlo foobar
250-shadow.my-wan.de
250-PIPELINING
250-SIZE 10240000
250-VRFY
250-ETRN
250-STARTTLS
250-ENHANCEDSTATUSCODES
250-8BITMIME
250 DSN
mail from: me        
250 2.1.0 Ok
rcpt to: me@outsideemail.com
250 2.1.5 Ok
data
354 End data with .
Subject: test
This is a test email
.
250 2.0.0 Ok: queued as A639C3EE6D
quit 
221 2.0.0 Bye

Some Access Restrictions

sudo nano /etc/postfix/main.cf

add

smtpd_recipient_restrictions =
        permit_sasl_authenticated,
        permit_mynetworks,
        reject_unauth_destination

Reload postfix:

sudo service postfix reload

Helo access restrictions

/etc/postfix/main.cf

smtpd_helo_required = yes
smtpd_helo_restrictions =
        permit_mynetworks,
        permit_sasl_authenticated,
        reject_invalid_helo_hostname,
        reject_non_fqdn_helo_hostname,
        reject_unknown_helo_hostname

smtpd_helo_restrictions =
        permit_mynetworks,
        permit_sasl_authenticated,
        reject_invalid_helo_hostname,
        reject_non_fqdn_helo_hostname,
        reject_unknown_helo_hostname,
        check_helo_access hash:/etc/postfix/helo_access

sudo nano /etc/postfix/helo_access

Add the following lines, edited for your domain:

shadow.my-wan.de        REJECT          Get lost - you're lying about who you are
mail.shadow.my-wan.de   REJECT          Get lost - you're lying about who you are

sudo postmap /etc/postfix/helo_access
sudo service postfix restart

Dovecot Part II

sudo nano /etc/dovecot/dovecot.conf

change

listen = *, ::

listen = *

sudo service dovecot restart

Tell Dovecot where your Mailbox is

sudo nano /etc/dovecot/conf.d/10-mail.conf

change

mail_location = mbox:~/mail:INBOX=/var/mail/%u

mail_location = maildir:~/Maildir

Instruct Postfix to use Dovecot SASL

add to

sudo nano /etc/postfix/main.cf

smtpd_sasl_type = dovecot
smtpd_sasl_path = private/auth
smtpd_sasl_auth_enable = yes

sudo nano /etc/dovecot/conf.d/10-master.conf

change to

service auth {
        unix_listener /var/spool/postfix/private/auth {
                mode = 0660
                user = postfix
                group = postfix
        }
}

and check

sudo nano /etc/dovecot/conf.d/10-auth.conf

disable_plaintext_auth = no
auth_mechanisms = plain login

Testing SASL

...

cat /var/log/mail.log | less

mailq
sudo postsuper -d ALL

TomsMailserver_V_4_2_4
TomsMailserver_V_4_2_4

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