Core dump overflow

Core dump in progress...

LFCS prep - Configure an IMAP service

| Comments

Today we continue with the IMAP/S of LFCS, by configuring Dovecot.

Dovecot is an open source IMAP / POP3 server written with security in mind. It can be installed on CentOS via the dovecot package.

Inside the /etc/dovecot.conf file you have to add / edit some settings:

1

protocols = imap pop3

The above also include the secure versions of IMAPS and POP3 secure.

Next you have to edit the mailbox and namespace file /etc/dovecot/conf.d/10-mail.conf:

1
2

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

These will set the mailbox location to /var/mail/username and will set the group to mail for privileged operations.

Inside /etc/dovecot/conf.d/10-ssl.conf ensure that the below lines are uncommented:

1
2

ssl_cert = </etc/pki/dovecot/certs/dovecot.pem
ssl_key = </etc/pki/dovecot/private/dovecot.pem

Dump the non-default settings if you want an overview of Dovecot’s settings:

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37

dovecot -n
# 2.2.10: /etc/dovecot/dovecot.conf
# OS: Linux 3.10.0-514.21.1.el7.x86_64 x86_64 CentOS Linux release 7.3.1611 (Core)  
first_valid_uid = 1000
mail_location = mbox:~/mail:INBOX=/var/mail/%u
mail_privileged_group = mail
mbox_write_locks = fcntl
namespace inbox {
  inbox = yes
  location = 
  mailbox Drafts {
    special_use = \Drafts
  }
  mailbox Junk {
    special_use = \Junk
  }
  mailbox Sent {
    special_use = \Sent
  }
  mailbox "Sent Messages" {
    special_use = \Sent
  }
  mailbox Trash {
    special_use = \Trash
  }
  prefix = 
}
passdb {
  driver = pam
}
protocols = imap pop3
ssl = required
ssl_cert = </etc/pki/dovecot/certs/dovecot.pem
ssl_key = </etc/pki/dovecot/private/dovecot.pem
userdb {
  driver = passwd
}

Start dovecot and check that it’s listening on its ports:

1
2
3
4
5

netstat -ltpn | grep dovecot
tcp        0      0 0.0.0.0:110             0.0.0.0:*               LISTEN      4629/dovecot        
tcp        0      0 0.0.0.0:143             0.0.0.0:*               LISTEN      4629/dovecot        
tcp        0      0 0.0.0.0:993             0.0.0.0:*               LISTEN      4629/dovecot        
tcp        0      0 0.0.0.0:995             0.0.0.0:*               LISTEN      4629/dovecot

Send a mail to a user:

1

echo "Readme" | mail -s "README" nixhat@example.com

The mail will be readable in /var/mail/nixhat. I installed the mutt client to view it:

1
2
3
4
5
6
7
8

i:Exit  -:PrevPg  <Space>:NextPg v:View Attachm.  d:Del  r:Reply  j:Next ?:Help
Date: Mon, 19 Feb 2018 19:35:30 +0200
From: root <root@example.com>
To: nixhat@example.com
Subject: README
User-Agent: Heirloom mailx 12.5 7/5/10

Readme
1
2
3
4
5
6
7
8
9

 ________________________________________
/ Avert misunderstanding by calm, poise, \
\ and balance.                           /
 ----------------------------------------
        \   ^__^
         \  (oo)\_______
            (__)\       )\/\
                ||----w |
                ||     ||

Comments