SMTP is close to being the perfect application protocol: it solves a - PDF document

� ☎ ✁ ☎ ✂ ✄ � ✂ ✁ � ✄ ✁ ✂ � ✄ � ✂ ✁ � ➓ ✷ ✉ ❲ ➁ ❹ ✁ ✁ ✉ ✁ → ◆ ◆ Ú ✁ ☎ ✂ ✄ � ✂ � ✂ ❪ ❪ ❪ ◆ ❐ ➼ ✁ ☎ ✂ ✄ � ✉ ✁ ✷ ✄ ✂ ✁ ✂ � ✉ ❤ ☎ ✁ ☎ � ✆ ✁ ☎ ✂ ✄ � ❲ ✂ ❉❋❊✵●✧❍❏■ ❑▼▲✲▲✼◆ ✻❖✪✺✫P✷ ✰✯✶✡◗✬✪✬❘✼❙✲❀❯❚✼❀✚✰✺✫✭✰✼✻✬✰✯◆ ❱✬❲ ❳✺❨❖❩✾❲ ❬✚❭ ❩✾❪❅❫✺❴❖❵❛❲ ❩❝❜✺❞✬❭ ❩✾❡▼❩✺❴❢❬❣❪ ❚✲❀❣✰✺✫✭✰✼✻✬✰✯◆ ✝✟✞✡✠☞☛✍✌✎✌✎✏✒✑ ✓✕✔✗✖✘✑✚✙✜✛✣✢✤✔✦✥✧✠✎★ ✐✺❥❦❥✲❱✺❧♠✐✺♥❦❨♦❩✺❲ ❥♠❩❢♣❢❬✵❥✸❲ ❫✾❴❝❪rq ❩✾❲✲❱✬❲ ❳✹❬ ❳✬s✒❳✺t ✈❖✇②①④③✭⑤✹⑥②⑤✒⑦ ✩✘✪✬✫✭✪✯✮✬✰✲✱✳✱✵✴✯✶✸✷ ✮✹✪✺✫✭✷ ✰✯✶✦✰✼✻✾✽✦✿✲✪✬✫✒✰✯❀✭✶✼❁✬✫✭❂✲❃❅❄❇❆✺❈ ⑧❦⑨⑩❥✲❱✺❧❦⑧❦❭ ❡❶❨✬t ❩❷⑨❅❫✺❭ t❢❥♠❲ ❫✾❴❝❪rq ❩✾❲⑩❱✬❲ ❳❢❬ ❳✬s✒❳✺t ✈❖✇②①❇❸✒③✹⑥②⑦ ⑧✬⑧❦✐ By Jonas Birmé (birme@cs.umu.se) ❺✭❻❝✇✚❼ ❽P❾ ❿✭➀ ➂②⑦ ➃✲➄✼⑧✼❧✼➅✚❴❢❬ ❩✾❲❣❴❖❩❖❬❣➆ ❪▼➃✲❭ ❩❖s♦❬ ❳✾❲ ♥➇⑧✹❩✺❲ ➈❦❭ s✒❩ ✈❖✇②①▼⑥②➉❢➊r➋✒➌✹⑥✚➉✒➊♦➍✭⑦ ➎⑩➏✲➏✼❚➐❑▼▲✲▲✼◆ ✻❖✪✺✫♦✷ ✰✯✶✡❚✲❀❣✰✺✫✭✰✼✻✬✰✯◆♠➑✼❀❣✪✲✱✵❙♠➒❷✰⑩❀r✮ ➔✼→P➣➐↔✹↕❝➙✬↕✾➛ ➜✎➝❏➞➠➟✎➡✳➡❶➢ ➤➦➥✳➥✳➧✚➨ ➩❶❍✕➫➭➨ ❊➲➯☞➳❯❍✤■➸➵✡➺➦➻✦➺✺❊✕➫✲❊✳➩❯❊✧➧ “SMTP is close to being the perfect application protocol: it solves a large, important problem in a minimalist way.” On the Design of Application Protocols (RFC3117) by Marshall T.Rose ➤➦➥✳➥✳➧✚➨ ➩❷❍✕➫✯➨ ❊➲➯☞➳▼❍✕■➸➵✗➺➦➻✦➺✺❊➐➫✲❊✦➩❯❊➲➧ Û✜➵✕➫❦ÜÝ❊➲➺✲Þ✍➤ß➥✧➥✦➧r➨ ➩❶❍➐➫✯➨ ❊✧➯✦à ❚♠✪✼❀❣✫✘✰✸➽④✪✳➾❅➚✸➪❢➶➘➹➷➴P➬✡➮④➱❇➱❇✃ ❒✼➮➭➪✹❐ ➹❇➾ ➏✲◆ ❙✼✻❝✫✒❀✚✰✯✶✸✷ ✻➸á➇✪✲✷ ⑧❦⑨⑩❥✲❱ ❄❇✽♠❙➸❮✎❙✼❰❅Ï✯✪✲◆ ✰♠➒Ð✴✸❤❖❙✯❀✚❤❶✫✚✰✧✰✲❰✬✫✒✪✸✷ ✶✦✿✼✰✲✻✬✴✯✱✵❙✼✶✺✫✭❤❛✰✲✶✳✿✲❙✼✱✵✪✯✶❦✿ â➭❙✸✱➐✰✺✫✒❙✵❄⑩❙✲❀✒✱✵✷ ✶❦✪✲◆✹❑➷✻❝✻✬❙✼❤❖❤ ➃✼❳✬sP❞✬❡❯❩✬❴✹❬ Ñ✤❩✺Ò❯⑧✹❩✾❲ ➈❝❩✾❲ ⑧✬⑧❦✐ Ñ✤❩✺Ò❶Ó✺❲ ❳❢Ô❯❪r❩✾❲ Õ×ÖØÖ➦Ù ➑♠✷ ❙✵❄④❀②✪✯✶❦❤❖➽r❙✼❀ ❥✲❱ ❮✎❙✯❰ ✐✺❥❦❥✲❱