1. CSIE 1 Filtering mail Speaker: Chung yu Wu Adviser: Quincy Wu Date: 2005/12/07

2. CSIE2 Outilne Mail protocol MUA 、 MTA 、 MDA Procmail Sendmail Predicament Regular Expression

3. CSIE3 POP3 POP3(Post Office Protocol, version 3) Is a client/server protocol in which e-mail is received and held for you by your Internet server. Periodically, you check your mail-box on the server and download any mail. port: 110

4. CSIE4 SMTP SMTP (Simple Mail Transfer Protocol) Is a protocol used in sending e-mail. port:25

5. CSIE5 IMAP IMAP (Internet Message Access Protocol) Is a standard protocol for accessing e-mail from your local server. Can view just the heading and the sender of the letter and then decide whether to download the mail

6. CSIE6 Send and received mail Client AClient B MTA relay mail SMTP send mail relay mail POP3 receive mail IMAP read or manage mail

7. CSIE7 MUA 、 MTA 、 MDA MUA: Mail User Agent  Outlook Express 、 Netscape Mail MTA: Mail Transfer Agent  Send mail  Received mail MDA: Mail Delivery Agent  Mail filtering

8. CSIE8 Send mail

9. CSIE9 Received mail

10. CSIE10 Relay Mail server sender Spam Company Open relay

11. CSIE11 Procmail MDA Filtering spam and virus Header: sender 、 receiver 、 address 、 title 。 Body: content Regular Expression

12. CSIE12 Use Procmail Forward #vi $HOME/.forward Insert “|exec /usr/local/bin/procmail” Procmailrc #vi ~/.procmailrc

13. CSIE13.Procmailrc Rules Notation Meaning :0Begin a recipe : Use a lock file *Begin a condition ^TO_ Look for a header that begins with To, Cc, Resent- To, or another destination specification

14. CSIE14.Procmailrc Rules(cont) :0[flags] :0: * ^Subject:*test /usr/mail/spam :0: * ^Body:*test /usr/mail/spam :0: * ^TOs94321544@ncnu.edu.tw /usr/mail/s94321544

15. CSIE15 Sendmail MTA Relay-domains Access Aliases Local-host-names

16. CSIE16 Relay-domains Allow configure domains relay mail #touch /etc/mail/relay-domains #vi /etc/mail/relay-domains 163.22.16. / *allow 163.22.16.xxx */ www.john.ipv6.club.tw

17. CSIE17 Access Process configure source mail Rules:  Ok: Unconditional accept  RELAY: Accept configure source mail  REJECT: Refusal configure source mail #vi /etc/mail/access 163.22.16.40 OK 163.22.16.33 RELAY John.ipv6.club.tw REJECT

18. CSIE18 Aliases Create a aliases to root #vi /etc/mail/aliases root: mutanwo staff: Mary,Bill,Jordan #newaliases

19. CSIE19 Local-host-names Received localhost send mail #vi /etc/mail/local-host-names ipv6.club.tw john.ipv6.club.tw xxx@ipv6.club.tw ok error xxx@john.ipv6.club.tw

20. CSIE20 Predicament Freebsd 5.4 Perl5.8.6+sendmail+procmail+spamassassin MTA: Sendmail MDA: Procmail+Spamassassin MUA: ELM Q1:Procmail path: ex:MAILDIR ， PATH 。 Q2: Procmail Log: Q3:.forward file 。 All mail send to /var/mail/mailnull not root

21. CSIE21 Regular Expression Search string ^^string ex: ’^test’ => testxxxx $string$ ex: ‘test&’ => xxxxtest * string* ex: ‘b*’ => △,b,bb,bbb,bbbb…...any string ex: ‘a.c’ =>abc,acc,foc…. [ ]String set ex: ‘[br]ear’ =>bear,rear

22. CSIE22 References http://spamassassin.apache.org/ http://www.procmail.org/ http://www.sendmail.org/ http://www.regular-expressions.info/tutorial.html