Mail SMTP-tashoshin jiragen ruwa da kuma su duk da muhimmancin

Yau za mu yi magana game da abin da amfani da SMTP-mashigai. Shi ne game da amfani da yadu cibiyar sadarwa yarjejeniya, tsara don e-mail watsa via TCP / IP networks.

darajar

Mail-SMTP tashar jiragen ruwa da aka farko aka bayyana a cikin shekarar 1982. Sau da yawa, Ya ambaci sunan yarjejeniya, nufi da fadada. Wannan bayani da aka tsara don aika fita mail yin amfani da tashar jiragen ruwa na TCP 25. Aiki a matakin mai amfani mail aikace-aikace yawanci amfani da SMTP don aika saƙonni zuwa cikin uwar garke domin kara relaying.

labarin

SMTP-mashigai riƙi asalin daga biyu realizations - SNDMSG da Mail Box layinhantsaki. Wannan bayani da aka ƙirƙira by Ray Tomlinson. fasahar ci gaba, yana ci gaba lokacin da 1970s, yayin da a shekarar 1980 babu internet a cikin zamani form. An tabbatar da cewa SMTP-mashigai aiki da kyau idan aika da karban na'urorin a kan hanyar sadarwa suna kullum alaka. Abin kula ne musamman Sendmail yanke shawara. Wannan shi ne daya daga cikin na farko saƙonni aika jamiái da suka yi amfani da SMTP da fasaha.

mail aiki

SMTP tashar jiragen ruwa yana amfani da yankin sunayen to gano wuri records na mai karɓa yankin mail Exchanger. Muna magana ne game da wani ɓangare na adireshin located a gefen dama na alama @. Lura cewa SSL SMTP tashar jiragen ruwa na e-mail zaman ta amfani da dace yarjejeniya da rufaffen connection. Bayan isar da sakon zuwa gida uwar garke saƙon da aka dawo da na'urar da abokin ciniki aikace-aikace amfani da IMAP yarjejeniya. Yana yana buɗewa samun bayanai da kuma sarrafa email. Har ila yau, ga manufar aka bayyana a POP yarjejeniya za a iya amfani, ko mallakar tajirai tsarin irin Microsoft Outlook ko Lotus Notes. Ka lura cewa an SMTP kai tsaye kayyade watsa saƙonni, amma ba abun ciki. Saboda haka, ba sakon ambulan, kazalika da ta sigogi. Duk da haka, da suna da kuma jiki na sakon da tsari ba su shafi.

layinhantsaki Overview

Ta hanyar da SMTP tashar jiragen ruwa da aikawa da karɓa na sakon suna da nasaba da juna. A zama dole data haka samu via wani abin dogara tashar. Sun ayan zama mai TCP-connection. SMTP-zaman ƙunshi umurnin aika da abokin ciniki, kazalika da jerin uwar garke martani. A sakamakon haka ne musayar sigogi. SMTP-aiki jerin qunshi uku umurnin / martani. MAIL DAGA nuna wani Adireshin dawo da ake bukata domin mayar da saƙonni. RCPT TO mai karɓa sunayen. Wannan umurnin za a iya amfani da mahara sau. Da zarar domin kowane mai karɓa.

DATA umurnin da aka yi amfani da kai tsaye ga riwayar saƙonnin rubutu. A wannan yanayin da muke magana ne game da abun ciki na saƙon, maimakon wani ɓangare na da harsashi. Wannan kashi ƙunshi jiki da kuma sakon BBC, wadda aka rabu da wani blank line. DATA - shi ne, a gaskiya ma wani rukuni na dokokin. Duk da haka, da uwar garke amsa ga su sau biyu. Da farko, kai tsaye zuwa cikin DATA umurninSa, game da shi, sun sanar da tsarin na shirye yarda da sako. Bugu da kari, da mayar da martani ke zuwa ƙarshen data jerin. Wajibi ne a dauki ko ƙin dukan wasika. Kowace daga cikin da yawa martani mai kyau ko korau Server, la'akari da matsayin ta code. A karshen iya zama na wucin gadi, ko kuma m. Ta hanyar wani na musamman code da uwar garke rahoton cewa akwai aka jiran ƙarin bayanai daga abokin ciniki. Cikakken aikin sabobin goyi bayan duk haruffa da za a resubmitted a taron na wani kuskure.

SMTP - wannan bayarwa yarjejeniya. Wannan shawarar ba za a iya dauka a cikin request saƙonni daga wani m uwar garken. Don dawo da e-mail, da kuma sarrafa mail akwatin halitta da sauran ladabi, kamar POP, da kuma IMAP. Don latest fasahar kamata a kõma, idan kwamfuta da aka ba ko da yaushe kunna ko yana wucin gadi samun dama zuwa Intanit.

Yanzu a ga m mail jerin gwano farawa. Muna magana ne game da siffofin na SMTP. Yana da damar mai nisa rundunar fara sarrafa sakon jerin gwano ta amfani da uwar garke. Saboda haka, karshen iya samun zama dole haruffa masa yin amfani da Juya umurninSa. Special ODMR fasahar damar isar da sako ga ingantashi mai amfani. E-mail ake bukata a lokacin da wani asusu da aka halitta ta amfani kawai Latin characters. Ga masu amfani da suka ba su da damar yin amfani da Turanci keyboard, da misali RFC 6531. Mun gode masa da aka ɓullo mail ya koya don gane "karin" haruffa. Saboda haka muka yi magana a takaicce game da abin da SMTP-tashoshin jiragen ruwa da kuma abin da suka yi amfani.