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Mail Server

Mail Server. Three major components MTA Mail Transfer Agent sendmail, Postfix, Dovecot MUA Mail User Agent mail, Evolution MDA Mail Delivery Agent procmail, maildrop. E-mail systems are heavily dependant on name resolution.

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Mail Server

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  1. Mail Server • Three major components • MTA • Mail Transfer Agent • sendmail, Postfix, Dovecot • MUA • Mail User Agent • mail, Evolution • MDA • Mail Delivery Agent • procmail, maildrop

  2. E-mail systems are heavily dependant on name resolution. For small networks you could use /etc/hosts, but any mail system that requires Internet access needs access to a fully functional DNS server

  3. MTA’s • sendmail and Postfix • Use SMTP to send mail • Dovecot • is used to enable POP3 and/or IMAP to receive mail. • SMTP, POP3 and IMAP are protocols, a set of rules for transferring data used by various mail transfer agents.

  4. Reception with Dovecot • Add the appropriate directive in the Dovecot configuration file. • Make sure Dovecot is set to start at boot • POP current version POP3 • Centralized mail depository, clients download messages for processing at the local host • IMAP current version IMAP4 • Maintains all messages on the server

  5. Dovecot Configuration Filehttp://wiki.dovecot.org/QuickConfiguration • /etc/dovecot.conf • protocols = pop3 pop3s imap imaps • listen = 10.161.25.131:10100 • #ssl listen = 10.161.25.131:10943 • For POP3S and IMAPS support • #ssl_disable = no • Activating Dovecot • chkconfig dovecot on • service dovecot start

  6. sendmail Configurationhttp://www.sendmail.org/ • Configured by two directory of files • /etc/mail • /usr/share/sendmail-cf • Two basic configuration files • sendmail-cf • for incoming mail • submit-cf • for outgoing mail

  7. sendmail.cf • mail configuration file • sendmail.mc • a macro that is easier to edit, used to generate a new sendmail.cf file • access • supports access control to your sendmail server, default is for local computer, host name or networks can be added to the list with a message to REJECT, DISCARD, or RELAY • domaintable • map different domains • i.e. what.com who.com • would forward mail sent to jblow@what.com to jblow@who.com

  8. statistic • Collects statistics on sendmail, can be read with the mailstats command • submit.cf • The main outgoing sendmail configuration file • sumbit.mc • a macro that is easier to edit, used to generate a new submit.cf file • virusertable • Supports email forwarding for users outside of your network

  9. Basic Directives in sendmail.mc • DAEMON_OPTIONS(`Port=smtp,Addr=127.0.0.1, Name=MTA')dnl • FEATURE(`accept_unresolvable_domains')dnl • Allow remote computers or network access to the local sendmail server you need to add their names or address to the access file. • connect:10.161 RELAY

  10. make –C /etc/mail • command is used to generate new .cf files from .mc files that have been edited. • Also processes files like access and virtusertable to database files (*.db) for use by sendmail

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