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COP 4343 Unix System Administration

COP 4343 Unix System Administration. Unit 14: email send and receive mail mail filtering mail server mailing lists. Understanding Email. Understanding Email. Mail Transfer Agent moves email from one server to another new: Mail Sending Agent Mail Delivery Agent

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COP 4343 Unix System Administration

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  1. COP 4343Unix System Administration Unit 14: email send and receive mail mail filtering mail server mailing lists

  2. Understanding Email

  3. Understanding Email • Mail Transfer Agent • moves email from one server to another • new: Mail Sending Agent • Mail Delivery Agent • places email in a user’s mailbox • Mail User Agent • manages email for user

  4. Mail User Agent • mail • pine • modern GUI-based email readers • thunderbird, mozilla mail • outlook, evolution • Kmail • WebMail

  5. Mail User Agent • mail • pine • read email from system mailbox • /var/mail/userid • send email via MTA directly

  6. GUI-based Mail User Agent • read email from mail server via • Internet Mail Access Protocol (IMAP) • Post Office Protocol (POP3) • send email to MTA via • Simple Mail Transport Protocol (SMTP) • new: authenticate/send email via MSA

  7. Mail Delivery Agent: procmail • filters email based on user-defined criteria • typical use • virus scan • www.clamav.net • spam scan • www.spamassassin.org

  8. Mail Transfer Agent • sendmail • Simple Mail Transport Protocol (SMTP) • TCP port 25 • new: TCP port 587 for MSA

  9. configuring a mail server • packages • sendmail • dovecot • for imap and pop3 • procmail • open firewall • imap: 143, pop3: 110, smtp: 25

  10. sendmail configuration • chkconfig sendmail on • configuration directory: /etc/mail • edit file: sendmail.mc dnl DAEMON_OPTIONS(`Port=smtp,Addr=127.0.0.1, Name=MTA') LOCAL_DOMAIN(`instructor.ege.com') MASQUERADE_AS(`instructor.ege.com') • install package sendmail-cf • make • service sendmail start • open firewall port 25

  11. sendmail MSA configuration • convention: • users send email via their ISP • possible: • allow sendmail to be RELAY • /etc/mail/access file • new: sendmail configured as MSA • requires authentication • sendmail MSA port: 587

  12. dovecot configuration • chkconfig dovecot on • service dovecot start • add ports 110 and 143 to iptables • /etc/dovecot.conf • example setting: first_valid_uid = 500

  13. procmail configuration • configuration • /etc/procmailrc • per user .procmailrc • also define environment variables • lists recipe to filter email :0 [flags] [ : [locallockfile] ] <zero or more conditions (one per line)> <exactly one action line>

  14. procmail examples :0 * ^Subject: .*scuba.* scubafile :0 * < 1000 ! myname@home :0 * ^^%! | lpr :0fw | processMailFilter

  15. spamassassin recipe • yum install spamassassin • chkconfig spamassassin on • service spamassassin start • /etc/procmailrc DROPPRIVS=yes :0fw | /usr/bin/spamc

  16. Mailing lists • establish alias to send bulk email • enable membership management • package: mailman

  17. mailman configuration • /etc/httpd/conf.d/mailman.conf • set domain name • restart httpd • set mailman passwd • /usr/lib/mailman/bin/mmsitepass password • Set the values for DEFAULT_EMAIL_HOST and DEFAULT_URL_HOST in /usr/lib/mailman/Mailman/mm_cfg.py

  18. mailman configuration • Update Mailman list files: /usr/lib/mailman/bin/update • Create a "site-wide" mailing list /usr/lib/mailman/bin/newlist mailman • you will need to add lines to /etc/aliases and then run newaliases • chkconfig mailman on • service mailman start • visit: http://instructor.ege.com/mailman

  19. mailman list management • select administrative interface from web page • follow prompt to create new list • email is sent to list administrator with instructions: • add lines to /etc/aliases file • run newaliases

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