Here, I would let you know how to configure mail server(MTA) and client(MUA) using evolution which is by default.
Environment: Fedora 25
we will understand few components before we setup email configurations/settings
MUA(Mail User Agent) or Mail Client: Application used to write/send/read email messages.
e.g Evolution, KMail, Outlook etc.. text based mail clients like pine, mail ..etc
MTA(Mail Transfer Agent):Transferring email messages from one computer to another(intranet or Internet). We would be configuring postfix in this section
MDA(Mail Delivery Agent): It will receive emails from the MTA and delivers them to relevant mailbox MUA(e.g Dovecot). There are few of the popular MDA which would remove unwanted email messages or spam before they reach MUA Inbox.(e.g Procmail ..etc )
SMTP(Simple Mail Transfer Protocol): communicates language that the MTA use to talk to each other and transfer message back and forth.
Architecture
Configuring MTA
Login as 'root' to perform below steps.
Note: SElinux was disabled.
- install postfix.
#dnf install postfix -y
-Take a backup copy of the file and copy paste below contents and change according to your infra setup.(lines marked in red)
#mv /etc/postfix/main.cf /etc/postfix/main.cf.original
# cat /etc/postfix/main.cf
1 compatibility_level = 2
2 queue_directory = /var/spool/postfix
3 command_directory = /usr/sbin
4 daemon_directory = /usr/libexec/postfix
5 data_directory = /var/lib/postfix
6 mail_owner = postfix
7 myhostname = fedora.localhost.com
8 mydomain = localhost.com
9 myorigin = $mydomain
10 inet_interfaces = $myhostname
11 inet_protocols = ipv4
12 mydestination = $myhostname, localhost.$mydomain, localhost, $mydomain
13 unknown_local_recipient_reject_code = 550
14 mynetworks = 192.168.122.0/24, 127.0.0.0/8, 10.0.0.0/24
15 alias_maps = hash:/etc/aliases
16 alias_database = hash:/etc/aliases
17 smtpd_banner = $myhostname ESMTP
18 debug_peer_level = 2
19 debugger_command =
20 PATH=/bin:/usr/bin:/usr/local/bin:/usr/X11R6/bin
21 ddd $daemon_directory/$process_name $process_id & sleep 5
22 sendmail_path = /usr/sbin/sendmail.postfix
23 newaliases_path = /usr/bin/newaliases.postfix
24 mailq_path = /usr/bin/mailq.postfix
25 setgid_group = postdrop
26 html_directory = no
27 manpage_directory = /usr/share/man
28 sample_directory = /usr/share/doc/postfix/samples
29 readme_directory = /usr/share/doc/postfix/README_FILES
30 meta_directory = /etc/postfix
31 shlib_directory = /usr/lib64/postfix
32 message_size_limit = 10485760
33 mailbox_size_limit = 1073741824
34 smtpd_sasl_type = dovecot
35 smtpd_sasl_path = private/auth
36 smtpd_sasl_auth_enable = yes
37 smtpd_sasl_security_options = noanonymous
38 smtpd_sasl_local_domain = $myhostname
39 smtpd_recipient_restrictions = permit_mynetworks,permit_auth_destination,permit_sasl_authenticated,reject
- start service persistent after reboot
# systemctl start postfix
# systemctl enable postfix
- If you had your firewall being running, add service 'smtp'.
#firewall-cmd --add-service=smtp --permanent
#firewall-cmd --reload
Configuring MDA
- install dovecot
#dnf install dovecot -y
-Take a backup copy of the file and copy paste below contents and change according to your infra setup.(lines marked in red)
#mv /etc/dovecot/dovecot.conf /etc/dovecot/dovecot.conf.original
#mv /etc/dovecot/conf.d/10-auth.conf /etc/dovecot/conf.d/10-auth.conf.original
#mv /etc/dovecot/conf.d/10-mail.conf /etc/dovecot/conf.d/10-mail.conf.original
#mv /etc/dovecot/conf.d/10-master.conf /etc/dovecot/conf.d/10-master.conf.original
#mv /etc/dovecot/conf.d/10-ssl.conf /etc/dovecot/conf.d/10-ssl.conf.original
# cat /etc/dovecot/dovecot.conf
1 protocols = imap pop3 lmtp
2 listen = *,::
3 dict {
4 }
5 !include conf.d/*.conf
6 !include_try local.conf
#
# cat /etc/dovecot/conf.d/10-auth.conf
1 disable_plaintext_auth = no
2 auth_mechanisms = plain login
3 !include auth-system.conf.ext
#
# cat /etc/dovecot/conf.d/10-mail.conf
1 mail_location = maildir:~/Maildir
2 namespace inbox {
2 namespace inbox {
3 inbox = yes
4 }
5 protocol !indexer-worker {
6 }
7 mbox_write_locks = fcntl
#
#
# cat /etc/dovecot/conf.d/10-master.conf
1 service imap-login {
2 inet_listener imap {
3 }
4 inet_listener imaps {
5 }
6 }
7 service pop3-login {
8 inet_listener pop3 {
9 }
10 inet_listener pop3s {
11 }
12 }
13 service lmtp {
14 unix_listener lmtp {
15 }
16 }
17 service imap {
18 }
19 service pop3 {
20 }
21 service auth {
22 unix_listener auth-userdb {
23 }
24 unix_listener /var/spool/postfix/private/auth {
25 mode = 0666
26 user = postfix
27 group = postfix
28 }
29 }
30 service auth-worker {
31 }
32 service dict {
33 unix_listener dict {
34 }
35 }
#
# cat /etc/dovecot/conf.d/10-ssl.conf
1 ssl = required
2 ssl_cert = </etc/pki/dovecot/certs/dovecot.pem
3 ssl_key = </etc/pki/dovecot/private/dovecot.pem
3 ssl_key = </etc/pki/dovecot/private/dovecot.pem
4 ssl_cipher_list = PROFILE=SYSTEM
#
#
- start service persistent after reboot
# systemctl start dovecot
# systemctl enable dovecot
- If you had your firewall being running, add service 'smtp'.
#firewall-cmd --add-service={pop3,imap} --permanent
#firewall-cmd --reload
Configure MUA
Click on 'Evolution' and configure as per below ...
Edit -> Preferences -> Add ->Next
Leave rest to default and continue to check [OK] .
Testing
Compose email and read yourself :)
Thanks
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