Homework 04 Mail System Computer Center CS NCTU

Homework 04 Mail System

Computer Center, CS, NCTU Architecture Mail Server domain. tld Users sub. domain. tld Internet SMTP POP 3/IMAP 2

Computer Center, CS, NCTU Requirement (1/4) q Get you own domain • http: //nctucs. net • Add a MX record for your mail server q Build a mail system • Anti-spam • Anti-virus q SMTP Server • Postfix • SASL Authentication • SSL and TLS support Ø SMTPs 3

Computer Center, CS, NCTU Requirement (2/4) q POP 3/IMAP Server • Dovecot • SSL and TLS support Ø POP 3 s/IMAPs q MTA filter • Amavisd-new Ø Spam. Assassin Ø Clam. AV q MDA filter • Procmail • Record all log to /var/log/procmail. log • Drop the mail whose subject contains keyword “ 安安你好” 4

Computer Center, CS, NCTU Requirement (3/4) q Greylisting • An anti-spam measure • Postgrey q Transport • The next-hop destination of nasa. cs. nctu. edu. tw would be nahw 4. nctucs. net q Alias • demo@nasa. cs. nctu. edu. tw q Rewriting • Redirect user+XYZ@domain. tld to user@domain. tld q Address masquerading 5 • From user@domain. tld instead of user@sub. domain. tld • All users except root

Computer Center, CS, NCTU Requirement (4/4) q Sender address verification • Disconnect suspicious SMTP clients • Deny from dynamic host Ø For example, 211 -76 -240 -234. dynamic. ntcu. net • Real-time Blackhole List (RBL) Ø http: //www. spamhaus. org/ • Whitelist Ø http: //www. spamhauswhitelist. com Ø http: //www. dnswl. org/ q DKIM signature and verification q SPF record and check • sid-milter • A SPF record for your server 6 Ø http: //www. mailradar. com/spf/

Computer Center, CS, NCTU 7 Bonus – Web-based interface q Webmail • Horde • Roundcube • Squirrelmail

Computer Center, CS, NCTU 8 Hand-in q Due • 6/12 q Demo • TBA