SMTP

TCP/IP-pino
sovelluskerros
sovelluskerros

sovelluskerros 		BGP · DHCP · DNS · ESMTP · FTP · HTTP · IMAP · IRC · LDAP · MGCP · NNTP · NTP · POP3 · RPC · RTP · RTSP · SIP · SMTP · SNMP · SOCKS · SSH · Telnet · TLS/SSL · XMPP  · (..lisää..)
kuljetuskerros
kuljetuskerros

kuljetuskerros 		TCP · UDP · QUIC · DCCP · SCTP · RSVP · RIP · ECN
verkkokerros
verkkokerros

verkkokerros 		IP (IPv4 ja IPv6) · ICMP (ICMPv6) · IGMP · IPsec
siirtoyhteyskerros ARP · IS-IS · NDP · OSPF · L2TP · PPP
fyysinen kerros

SMTP (lyhenne sanoista Simple Mail Transfer Protocol) on TCP-pohjainen protokolla, jota käytetään viestien välittämiseen sähköpostipalvelimien kesken.[1]

Protokollalle on varattu portti 25.

Nykyaikaiset postipalvelimet käyttävät alkuperäisen SMTP:n sijasta laajennettua ESMTP-protokollaa.

SMTP-protokolla määriteltiin ensimmäisen kerran RFC 821:ssä elokuussa vuonna 1982.

Sähköpostin nouto

Postin noutoa varten postipalvelimelta postiohjelmaan ovat postinnoutoprotokollat erikseen, eli ns. ”pull”-protokollat.

Näitä ovat muun muassa POP3 (lyhenne sanoista Post Office Protocol versio 3), IMAP (lyhenne sanoista Internet Mail Access Protocol) ja HTTP (lyhenne sanoista Hypertext Transfer Protocol) esimerkiksi Hotmail, IlohaMail.

Sähköpostin kulku

  1. A kirjoittaa sähköpostiviestin postiohjelmallaan (esimerkiksi Outlook).
  2. A:n postiohjelma lähettää viestin A:n postipalvelimelle (eng. mail server).
  3. A:n postipalvelin ottaa TCP-yhteyden B:n postipalvelimelle.
  4. A:n postipalvelin siirtää (”push”) viestin SMTP-protokollalla B:n postipalvelimelle.
  5. B:n postipalvelin laittaa viestin B:n postilaatikkoon.
  6. B:n postiohjelma noutaa viestin postinnoutoprotokollalla (”pull”) (esimerkiksi POP3) postiohjelmaan ja B lukee viestin.

SMTP-palvelimia

Lähteet

  1. ↑ Robin Anderson ja Andy Johnston: UNIX unleashed, 4. painos, s. 503. Sams Publishing, 2002. ISBN 9780672322518

Aiheesta muualla

Read other articles:

Liga 3 2018 Jawa Timur

Liga 3 Jawa TimurMusim2018JuaraPersiga Trenggalek← 2017 2019 → Seluruh statistik akurat per 5 April 2019. Liga 3 Zona Jawa Timur adalah Kompetisi kasta ke 3 Liga Indonesia yang di jalankan oleh Asosiasi Provinsi (Asprov) PSSI Jawa Timur sebagai babak kualifikasi untuk putaran nasional dari Liga 3. Liga 3 Zona Jawa Timur diikuti oleh 49 klub yang terbagi menjadi 7 Grup. Tim peserta Berikut adalah peserta liga 3 zona Jawa Timur pada kompetisi tahun 2018[1] Grup 1 Banyuwangi Putra Si...

 

Нюкта

У этого термина существуют и другие значения, см. Нюкта (значения). Иное название этого понятия — «Никс»; см. также другие значения. Нюкта/Никтадр.-греч. Νυκτός Нюкта, богиня ночи (Адольф Вильям Бугро — «Ночь» (1883)) Мифология древнегреческая религия Сфера влияния ночь ...

 

Carlos Tayag

Filipino Benedictine deacon and activist In this Philippine name, the middle name or maternal family name is Nuqui and the surname or paternal family name is Tayag. Carlos TayagO.S.B.Detail of the Wall of Remembrance at the Bantayog ng mga Bayani, showing names from the first batch of Bantayog Honorees, including that of Carlos Tayag.PersonalBorn(1942-08-24)August 24, 1942Angeles, Pampanga, Commonwealth of the PhilippinesDiedAugust 17, 1976 (aged 33)Quezon City, PhilippinesCause...

Gordon Ramsay's 24 Hours to Hell and Back

American cooking television series Gordon Ramsay's 24 Hours to Hell and BackGenreReality televisionStarringGordon RamsayCountry of originUnited StatesOriginal languageEnglishNo. of seasons3No. of episodes28ProductionExecutive producersGordon RamsayMichael Van BriesenChris BrodgenLayla SmithGreg LipstoneTim WarrenProduction companiesStudio RamsayAll3Media AmericaOriginal releaseNetworkFoxReleaseJune 13, 2018 (2018-06-13) –May 12, 2020 (2020-05-12) Gordon Ramsay's 24 Hours to H...

 

Small nucleolar RNA snoMBI-87

Small nucleolar RNA SNORA36 familyPredicted secondary structure and sequence conservation of SNORA36IdentifiersSymbolSNORA36Alt. SymbolssnoMBI-87RfamRF00340Other dataRNA typeGene; snRNA; snoRNA; H/ACA-boxDomain(s)EukaryotaGOGO:0006396 GO:0005730SOSO:0000594PDB structuresPDBe In molecular biology, Small nucleolar RNA MBI-87 is a non-coding RNA (ncRNA) molecule which functions in the biogenesis (modification) of other small nuclear RNAs (snRNAs). This type of modifying RNA is located in the nuc...

 

Ghezala

Ghezala's Panorama Place in Bizerte Governorate, TunisiaGhezala غزالةGhezalaLocation in TunisiaCoordinates: 37°05′02″N 9°32′08″E / 37.08389°N 9.53556°E / 37.08389; 9.53556Country TunisiaGovernorateBizerte GovernoratePopulation (2004) • Total5,490Time zoneUTC1 (CET) Ghezala is a town of north-western Tunisia located at 50 kilometres west of Bizerte and 70 kilometres northwest of Tunis. Attached to the Bizerte Governorate, it is the admi...

Alberto Viani

Questa voce o sezione sull'argomento scultori italiani non cita le fonti necessarie o quelle presenti sono insufficienti. Puoi migliorare questa voce aggiungendo citazioni da fonti attendibili secondo le linee guida sull'uso delle fonti. Segui i suggerimenti del progetto di riferimento. Questa voce sull'argomento scultori italiani è solo un abbozzo. Contribuisci a migliorarla secondo le convenzioni di Wikipedia. Segui i suggerimenti del progetto di riferimento. The Girl Friend, di...

 

История Канады

История Канады — история страны, которая занимает северную часть североамериканского континента[1]. Первоначально страна была населена автохтонным населением, затем Канада благодаря иммиграции из Европы превратилась в официально двуязычную федерацию, мирным п...

 

韩国—马来西亚关系

韓國－馬來西亞關係 马来西亚 韩国 代表機構马来西亚驻韩国大使馆韩国驻马来西亚大使馆 韩国－马来西亚关系（韩语：대한민국-말레이시아 관계，馬來語：Hubungan Korea Selatan–Malaysia），亦称马来西亚－韩国关系，指韩国与马来西亚两国之间的双边关系。目前两国为“战略伙伴关系”。 历史 韩国与马来亚联合邦于1960年2月23日建交[1]。1962年5月，韩国在马来亚首都吉...

俄亥俄州

  「俄亥俄」重定向至此。关于其他用法，请见「俄亥俄 (消歧义)」。 俄亥俄州 美國联邦州State of Ohio 州旗州徽綽號：七葉果之州地图中高亮部分为俄亥俄州坐标：38°27'N－41°58'N, 80°32'W－84°49'W国家 美國加入聯邦1803年3月1日，在1953年8月7日追溯頒定（第17个加入联邦）首府哥倫布（及最大城市）政府 • 州长（英语：List of Governors of {{{Name}}}]]） •&...

 

Marc Klok

Marc Klok Klok dengan Indonesia pada 2023Informasi pribadiNama lengkap Marc Anthony KlokTanggal lahir 20 April 1993 (umur 31)[1]Tempat lahir Amsterdam, BelandaTinggi 177 m (580 ft 9 in)[2]Posisi bermain Gelandang tengahInformasi klubKlub saat ini Persib BandungNomor 23Karier junior AVV Zeeburgia UtrechtKarier senior*Tahun Tim Tampil (Gol)2011–2013 Jong Utrecht 17 (2)2013–2014 Ross County 6 (0)2014–2016 Cherno More 37 (0)2016 Oldham Athletic 10 (0)201...

 

Aryandes

Persian satrap of Egypt between 525 BCE and 496 BCE AryandesSatrap of EgyptAryandes was the first satrap of the Achaemenid Province of Egypt.Predecessornew officeSuccessorPherendatesDynasty27th DynastyPharaohCambyses II to Darius I Aryandes (Old Iranian: Aryavanda[1]: 266  or Arvanta, Ancient Greek: Ἀρυάνδης) was the first Achaemenid satrap of ancient Egypt between 525 BCE and 496 BCE, during the early 27th Dynasty of Egypt. Career When king Cambyses II defeat...

Mini-VGA

Mini-VGALo spinotto Mini-VGA su un iBook TipoConnettore video analogico per computer Informazioni storichePredecessoreConnettore VGA Sostituito dalMini-DVI Specifiche fisicheNº pin14 PiedinaturaUn connettore Mini-VGA femmina PIN 1 GND GND PIN 2 VSync N.C. PIN 3 HSync N.C. PIN 4 Red Return GND PIN 5 Red video S-Video (C) PIN 6 Green return GND PIN 7 Green video S-Video (Y) PIN 8 +5 V +5 V PIN 9 Blue video Composite video PIN 10 DDC data DDC data PIN 11 DDC clock DDC clock PIN 12 GND GND PIN 1...

 

Nicolaas Rubens, Lord of Rameyen

Albert and Nicolaas Rubens, Lord of Rameyen. Nicolaas Peter Paul Rubens, Lord of Rameyen (1618–1655) was a son of the painter Peter Paul Rubens and Isabella Brant. Family Main article: Rubens family Rubens married Constancia Helman (1609–1678) in 1640, who was the daughter of Ferdinand Helman, Schepen of Antwerp and Catherine vander Veken, both of whom are buried in Saint James' Church. Nicolaas Rubens, Lord of Rameyen 1.0.0/ Albert Maria Rubens, Lord of Rameyen (1642–1672): alderman of...

 

Федеральне бюро розслідувань

Федеральне бюро розслідувань (ФБР)англ. Federal Bureau of Investigation (FBI)     значок Будівля ФБР у Вашингтоні Загальна інформація: Тип: федеральний Юрисдикція:  США Дата заснування: 26 липня 1908 Девіз: Fidelity, Bravery, Integrityукр. Вірність, хоробрість, чесність Структура: Директор: Крістоф...

Division of Lingiari

Australian federal electoral divisionLingiari redirects here. For the person the division is named after, see Vincent Lingiari. Australian electorate LingiariAustralian House of Representatives DivisionDivision of Lingiari in the Northern Territory, as of the 2022 federal election (excluding Christmas Island and the Cocos (Keeling) Islands)Created2001MPMarion ScrymgourPartyLaborNamesakeVincent LingiariElectors74,050 (2022)Area1,352,371 km2 (522,153.4 sq mi)DemographicRural...

 

Cyropolis

Ancient Achaemenid city in Central Asia For the ancient town of Media Atropatene, see Cyropolis (Media Atropatene). KhujandJizakIstaravshanKurkathclass=notpageimage| Map of Tajikistan with possible locations of Cyropolis pinpointed.[1][2][3] Map of the Achaemenid Empire showing the location of Cyropolis in Sogdiana. Cyreschata (Old Persian: Kuruškaθa),[4][5] better known by its Latin name Cyropolis (Greek: Κυρούπολις or Κύρου πόλις...

 

الإبادة الجماعية للشركس

الإبادة الجماعية الشركسية رجال الجبل يغادرون الاتحاد، بريشة بيوتر غروزينسكي عام 1872 المعلومات البلد الإمبراطورية الروسية  الموقع شركيسيا  الإحداثيات 43°35′07″N 39°43′13″E / 43.585278°N 39.720278°E / 43.585278; 39.720278   الهدف شركس  نوع الهجوم إبادة جماعية، قتل جماعي، ته...

Coppa Nordamericana di bob

Coppa NordamericanaSport Bob FederazioneIBSF ContinenteNordamerica OrganizzatoreInternational Bobsleigh & Skeleton Federation CadenzaAnnuale Aperturanovembre Chiusuragennaio FormulaCircuito annuale Sito Internetwww.ibsf.org StoriaDetentoreBob a due donne Brittany ReinboltBob a due uomini Frank DelducaBob a quattro uomini Taylor AustinCombinata uomini Taylor Austin Ultima edizionestagione 2021/22 Prossima edizionestagione 2022/23 Modifica dati su Wikidata · Manuale La Coppa Nordameri...

 

日吉大社

日吉大社 西本宮 本殿(国宝)所在地 滋賀県大津市坂本5丁目1-1位置 北緯35度4分24.4秒 東経135度51分53.9秒 / 北緯35.073444度 東経135.864972度 / 35.073444; 135.864972座標: 北緯35度4分24.4秒 東経135度51分53.9秒 / 北緯35.073444度 東経135.864972度 / 35.073444; 135.864972主祭神 西本宮：大己貴神東本宮：大山咋神社格等 式内社（名神大）二十二社（下八社）旧官幣...