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E-mail & lists client view Anne Villems University of Tartu, Estonia
Everybody has used e-mail! <ul><li>But how many have read documents, which set the standards for e-mail? </li></ul><ul><li...
Mail Standard RFC822 <ul><li>Published in 1982 </li></ul><ul><li>Lines no longer than 1000 char </li></ul><ul><li>Message ...
RFC 822 restrictions <ul><li>no multiple objects in a single message </li></ul><ul><li>no multi-part message bodies </li><...
ASCII times are over! <ul><li>Now we want: </li></ul><ul><li>National language support </li></ul><ul><li>Possibility to se...
MIME - Multipurpose Internet Mail Extension <ul><li>RFC 2045-2048 obsolete RFC 1521, 1522,1590 </li></ul><ul><li>RFC 2045 ...
MIME defines new header lines <ul><li>MIME-Version header field: </li></ul><ul><li>MIME-Version: 1.0 </li></ul><ul><li>The...
“Content type” possible values <ul><li>Text - textual information  </li></ul><ul><li>Image - for transmitting still images...
Content-transfer-Encoding <ul><li>base64 - every 3 bytes are represented  with 4  7-bit ASCII characters </li></ul><ul><li...
Quoted-printable <ul><li>Suitable to present most European languages which are based on ISO 8859-x standard </li></ul><ul>...
Where to get more info about MIME <ul><li>RFC archive with all RFC-s in plain text: </li></ul><ul><li>ftp://ftp.carnet.hr/...
How e-mail works <ul><li>User Agent (UA) - program, with which human users read, create and manage e-mail </li></ul><ul><l...
Working protocols <ul><li>SMTP - primary mechanism for moving mail around TCP/IP network, handles sites with permanent con...
POP, IMAP <ul><li>Aim - to build a distributed e-mail infrastructure </li></ul><ul><li>LAN oriented, vendor specific </li>...
What we want from Mail client? <ul><li>Good user interface </li></ul><ul><li>advanced text editing </li></ul><ul><li>spell...
…more requirements for mail client: <ul><li>signatures (multiple?) </li></ul><ul><li>database </li></ul><ul><li>sophistica...
Mail Clients <ul><li>You can find 28 mail clients in Tucows ultimate software collection for Win95, 13 for Mac and 11 for ...
Most popular clients <ul><li>The Pegasus Mail, no fee, version 2.54 </li></ul><ul><li>http://www.pegasus.usa.com/ </li></u...
Problems going from Eudora to Pegasus <ul><li>Your Adressbooks are not convertible. </li></ul><ul><li>There exists Intergu...
To compare Mail Clients <ul><li>Stroud’s Mail Client Reviews with about 20 packages reviewed: </li></ul><ul><li>http://cws...
Some words about Netiquette <ul><li>Be polite! </li></ul><ul><li>Cite as small part of the letter as possible! </li></ul><...
Questions <ul><li>??? </li></ul><ul><li>??? </li></ul><ul><li>??? </li></ul>
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香港六合彩 » SlideShare

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这突如其来的变故,黑龙堂众人都有些措手不及,不少有还在揉搓被灯光晃花的眼睛。

由于黑龙堂众人聚拢的密度过大,摩托车不可避免的刮倒两个人,堪堪停玩弄陶德霖身边,香港六合彩脚一撑地,向左倾斜的车子又重新直立起来,心道:还好哈雷的性能不错,不然今天可就车毁人亡了。

陶德霖昂首挺胸朝前走,一点没有反应过来,刚才车灯晃动是香港六合彩的侧边,只道是路过的车辆而已,并不以为然。直到车轮刮擦地面发出令人牙酸的刺耳声音,香港六合彩才惊觉回头,大概这两个月的奢侈腐败生活已经让这个曾经的金牌打手丧失了最基本的警惕性。

颈风压面而来,两人同时扭头,相对不到半尺距离,彼此和呼吸声清晰可闻,甚至连对方几根鼻毛都数得一清二楚,陶德霖脸上写满惊

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Transcript of "香港六合彩 » SlideShare"

  1. 1. E-mail & lists client view Anne Villems University of Tartu, Estonia
  2. 2. Everybody has used e-mail! <ul><li>But how many have read documents, which set the standards for e-mail? </li></ul><ul><li>These standards have been set up in the documents: </li></ul><ul><li>RFC 822 / RFC 821 </li></ul><ul><li>MIME standards set in </li></ul><ul><li>RFC 2045/2046/2047/2048 </li></ul><ul><li>(old verson RFC 1521/1522) </li></ul>
  3. 3. Mail Standard RFC822 <ul><li>Published in 1982 </li></ul><ul><li>Lines no longer than 1000 char </li></ul><ul><li>Message body - plain US-ASCII text </li></ul><ul><li>Message header lines - plain US-ASCII text </li></ul><ul><li>Limit on message length </li></ul>
  4. 4. RFC 822 restrictions <ul><li>no multiple objects in a single message </li></ul><ul><li>no multi-part message bodies </li></ul><ul><li>no non-textual bodies </li></ul><ul><li>no X.400 messages can be gatewayd </li></ul><ul><li>no multifont messages </li></ul>
  5. 5. ASCII times are over! <ul><li>Now we want: </li></ul><ul><li>National language support </li></ul><ul><li>Possibility to send </li></ul><ul><ul><li>pictures </li></ul></ul><ul><ul><li>audiofiles </li></ul></ul><ul><ul><li>other applications </li></ul></ul><ul><ul><li>video files </li></ul></ul><ul><ul><li>multimedia applications </li></ul></ul>
  6. 6. MIME - Multipurpose Internet Mail Extension <ul><li>RFC 2045-2048 obsolete RFC 1521, 1522,1590 </li></ul><ul><li>RFC 2045 Format of Internet Message Bodies </li></ul><ul><li>RFC 2046 Media Types </li></ul><ul><li>RFC 2047 Message Header Extension for Non-ASCII Text </li></ul><ul><li>RFC 2048 Registration Procedures </li></ul><ul><li>To solve RFC822 restrictions without serious incompatibilities with it </li></ul>
  7. 7. MIME defines new header lines <ul><li>MIME-Version header field: </li></ul><ul><li>MIME-Version: 1.0 </li></ul><ul><li>The content type header field to specify the the type and subtype of data in the body: </li></ul><ul><li>Content-Type: Text/Plain: Charset=ISO-8859-1 </li></ul><ul><li>Content-Transfer-Encoding field to show how data is encoded </li></ul><ul><li>Content-Transfer-Encoding: QUOTED-PRINTABLE </li></ul><ul><li>Content-ID and Content-Description for future use </li></ul>
  8. 8. “Content type” possible values <ul><li>Text - textual information </li></ul><ul><li>Image - for transmitting still images (gif,jpeg) </li></ul><ul><li>Audio - requires audio output device </li></ul><ul><li>Video - to display moving images, like mpeg </li></ul><ul><li>Application - information to be processed by application program </li></ul><ul><li>Multipart - to represent compound, possibly embedded parts </li></ul><ul><li>Message - an encapsulated message </li></ul>
  9. 9. Content-transfer-Encoding <ul><li>base64 - every 3 bytes are represented with 4 7-bit ASCII characters </li></ul><ul><li>quoted-printable - will code only non-ASCII characters in the text, 76char lines </li></ul><ul><li>7bit - no coding, already 7bit </li></ul><ul><li>8bit - have to be transported as 8-bit </li></ul><ul><li>binary - as 8bit, but may contain long lines </li></ul>
  10. 10. Quoted-printable <ul><li>Suitable to present most European languages which are based on ISO 8859-x standard </li></ul><ul><li>Non-ASCII chars will be coded with 3 chars: ´=´ followed by code in base (16) Examples: </li></ul><ul><li>Ü =DC ä =E4 ö =F6 </li></ul>
  11. 11. Where to get more info about MIME <ul><li>RFC archive with all RFC-s in plain text: </li></ul><ul><li>ftp://ftp.carnet.hr/pub/Internet/rfc/ </li></ul><ul><li>Mark Grand’s “MIME Overview” </li></ul><ul><li>http://www.mindspring.com/~mgrand/mime.html </li></ul><ul><li>comp.mail.mime FAQ </li></ul><ul><li>http://www.cis.ohio-state.edu/text/faq/ usent/mail/mime-faq/ </li></ul>
  12. 12. How e-mail works <ul><li>User Agent (UA) - program, with which human users read, create and manage e-mail </li></ul><ul><li>Mail Transport Agent (MTA) - handling the movement of messages among computers, non-real-time manner; SMTP - Simple Mail Transfer Protocol - must be installed at every Internet Host </li></ul>
  13. 13. Working protocols <ul><li>SMTP - primary mechanism for moving mail around TCP/IP network, handles sites with permanent connections </li></ul><ul><li>SMTP delivers mail, not allows user to collect it - sometimes the latter is more convenient </li></ul><ul><li>POP, IMAP - fill the gap, they are oriented to serve users when they want </li></ul>
  14. 14. POP, IMAP <ul><li>Aim - to build a distributed e-mail infrastructure </li></ul><ul><li>LAN oriented, vendor specific </li></ul><ul><li>POP - Post Office Protocol, latest version POP3, RFC 1725 (1460) </li></ul><ul><li>IMAP - the Internet Message Access Protocol, latest version IMAP4, RFC2060 (1731) </li></ul>
  15. 15. What we want from Mail client? <ul><li>Good user interface </li></ul><ul><li>advanced text editing </li></ul><ul><li>spelling checker </li></ul><ul><li>attachments allowed </li></ul><ul><li>addressbook (with groups!) </li></ul><ul><li>MIME </li></ul><ul><li>uudencode/decode </li></ul><ul><li>Encryption! </li></ul><ul><li>+ mailing lists </li></ul><ul><li>pager support </li></ul><ul><li>multiple accounts </li></ul><ul><li>multilingual support </li></ul><ul><li>full text indexing + search </li></ul><ul><li>message filtering </li></ul><ul><li> … and more </li></ul>
  16. 16. …more requirements for mail client: <ul><li>signatures (multiple?) </li></ul><ul><li>database </li></ul><ul><li>sophisticated send: </li></ul><ul><li>send e-mail to all my students who live in Liberty street </li></ul><ul><li>download headers and delete mail from server based on header info </li></ul><ul><li>UseNet Newsgroups </li></ul><ul><li>Live spelling </li></ul><ul><li>Thesaurus </li></ul><ul><li>auto-dialing </li></ul><ul><li>Free Internet Fax </li></ul><ul><li>Confirmation ability </li></ul><ul><li>… </li></ul><ul><li>… </li></ul>
  17. 17. Mail Clients <ul><li>You can find 28 mail clients in Tucows ultimate software collection for Win95, 13 for Mac and 11 for win 3.x </li></ul><ul><li>They need from 65K to 4.5M memory </li></ul><ul><li>Tocows has mirrors in many countries </li></ul><ul><li>one in Croatia: </li></ul><ul><li>http://www.hrt.hr/tucows/ </li></ul>
  18. 18. Most popular clients <ul><li>The Pegasus Mail, no fee, version 2.54 </li></ul><ul><li>http://www.pegasus.usa.com/ </li></ul><ul><li>FAQ http://www.let.nl/pegasus/faq.html </li></ul><ul><li>Eudora (Qualcomm Inc.) </li></ul><ul><ul><li>Eudora Pro 3.0.3 </li></ul></ul><ul><ul><li>Eudora Light 3.0.3 </li></ul></ul><ul><li>http://www.qualcomm.com/ </li></ul>
  19. 19. Problems going from Eudora to Pegasus <ul><li>Your Adressbooks are not convertible. </li></ul><ul><li>There exists Interguru Web-site to help you to convert Eudora nickname file to Pegasus address file: </li></ul><ul><li>http://www.interguru.com/eudopega.htm </li></ul>
  20. 20. To compare Mail Clients <ul><li>Stroud’s Mail Client Reviews with about 20 packages reviewed: </li></ul><ul><li>http://cws.internet.com/32mail-reviews.html </li></ul><ul><li>Intervue Internet Client reviews: </li></ul><ul><li>http://www.eqp.com/egrinter.html </li></ul><ul><li>Tucows has evaluated all packages with 0.5 - 5 cows. </li></ul>
  21. 21. Some words about Netiquette <ul><li>Be polite! </li></ul><ul><li>Cite as small part of the letter as possible! </li></ul><ul><li>DO NOT USE UPPER CASE LETTERS THROUGHOUT THE LETTER </li></ul><ul><li>Use “smilies”: :-) :-( ;-) </li></ul><ul><li>Take differencies in the culture into account. </li></ul>
  22. 22. Questions <ul><li>??? </li></ul><ul><li>??? </li></ul><ul><li>??? </li></ul>
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