POP3 bruges til at sende e-mails. Det er den tredje udgave af postprotokollen. Med et POP3-aktiveret mailprogram kan du hente mails fra en server. Afh\u00e6ngigt af indstillingen slettes mailbeskederne efter hentning p\u00e5 serveren og gemmes derefter kun p\u00e5 din endelige enhed (pc, tablet, smartphone eller lignende). Du tager praktisk talt mails ud af postkassen p\u00e5 serveren for indg\u00e5ende post, som midlertidigt gemmer dem for dig, indtil du henter dem, ligesom du tager et klassisk brev ud af din postkasse. POP3-mailoverf\u00f8rselsprotokollen, en s\u00e5kaldt ASCII-protokol, er beskrevet i detaljer i den internationalt gyldige RFC 1939-regel og bruger generelt port 110 eller, i det krypterede tilf\u00e6lde, 995, som muligvis skal aktiveres i firewallreglerne.<\/p>\n
Post Office Protocol blev f\u00f8rst udviklet til Unix-omr\u00e5det, men kan nu bruges fra n\u00e6sten alle styresystemer, hvis der er installeret passende mailsoftware p\u00e5 dem. POP3 har v\u00e6ret i brug siden 1988 og er genstand for l\u00f8bende, for det meste mindre, tilpasninger til den aktuelle udvikling inden for computer- og internetteknologi. POP1 blev udviklet allerede i 1984 og blev afl\u00f8st af POP2 blot et \u00e5r senere. POP4, som skulle have yderligere funktioner i forhold til POP3, har endnu ikke v\u00e6ret i stand til at etablere sig. I stedet er det nu muligt med POP3S at overf\u00f8re brugerdata i krypteret form. Hvis du \u00f8nsker at hente e-mail p\u00e5 en enkel og klart angivet m\u00e5de, kan du stadig bruge POP3 eller POP3S, som alligevel er forudindstillet i de fleste aktuelle mailklienter, via en sikker SSL-forbindelse (eller TSL).<\/p>\n
For at kunne hente de e-mails, der er modtaget p\u00e5 serveren, kr\u00e6ves der autentificering, efter at forbindelsen til serveren er blevet etableret. Brugernavnet er gemt i mailprogrammet. Adgangskoden kan ogs\u00e5 gemmes, men af sikkerhedshensyn b\u00f8r der aftales en foresp\u00f8rgsel i indstillingerne. Derefter anmodes der om adgangskoden. Disse login-data sendes nu til serveren. Sidstn\u00e6vnte starter derefter den faktiske overf\u00f8rsel af dine e-mails, den ene efter den anden. N\u00e5r alle mails p\u00e5 serveren er blevet overf\u00f8rt, udf\u00f8rer serveren normalt en slettekommando. Undtagelse: Du har indstillet dit klientprogram til at efterlade de allerede modtagne meddelelser p\u00e5 serveren. Denne undtagelse fungerer dog kun, hvis din mailudbyder tillader og stiller en s\u00e6rlig udvidelse til r\u00e5dighed, som faktisk ikke h\u00f8rer til POP3. Efter hentningen afbrydes forbindelsen mellem server og klient.<\/p>\n
En af fordelene er, at du ikke beh\u00f8ver at v\u00e6re online permanent, men kun p\u00e5 det tidspunkt, hvor du henter mailen. Der er dog ingen synkronisering mellem flere klientenheder, hvilket er en ulempe. Det betyder, at du ikke automatisk har den samme aktuelle status for dine e-mails fra hver terminal. POP3 h\u00e5ndterer praktisk talt kun processen med at liste, hente og slette mails. Hvis du \u00f8nsker mere funktionalitet, er det tilr\u00e5deligt at bruge en anden mailprotokol som f.eks. IMAP<\/a> der skal v\u00e6lges. I tilf\u00e6lde af simpel POP3 overf\u00f8res nogle af brugerdataene i klar tekst. POP3S er noget mere sikker.<\/p>\n Foruds\u00e6tningen for at hente e-mails via POP3 er de korrekte indstillinger i et mailprogram i en klient. Afh\u00e6ngigt af styresystemet og mailsoftwaren kan disse v\u00e6re mere eller mindre omfattende. De grundl\u00e6ggende funktioner er dog de samme i alle mailklienter. V\u00e6lg f\u00f8rst POP3 som den transmissionsmetode, der skal anvendes. F\u00f8rst skal du bruge den mailadresse, du tidligere har registreret hos mailudbyderen, din Brugernavn<\/a> og den tilsvarende adgangskode. Endvidere kan navnet eller den IP-adresse<\/a> p\u00e5 serveren for indg\u00e5ende post er p\u00e5kr\u00e6vet. De fleste moderne mailprogrammer s\u00f8ger selv efter den ansvarlige server, n\u00e5r de har indtastet mailadressen. Ellers kan du finde det n\u00f8dvendige servernavn p\u00e5 mailudbyderens supportside. Med nogle mailprogrammer er det ogs\u00e5 muligt at oprette en ny mailadresse via dette program. Som modstykke til POP3 har du stadig brug for en server for udg\u00e5ende post, som normalt kan sende dine mails via SMTP (Simple Mail Transfer Protocol) eller, i nyere tid, ofte via ESMTP (Extended Simple Mail Transfer Protocol). Ofte bruger udbydere den samme server som til udg\u00e5ende post. Under alle omst\u00e6ndigheder finder du navnet p\u00e5 den ansvarlige server det samme sted som navnet p\u00e5 POP3-serveren. De fleste mailklienter indstiller automatisk de n\u00f8dvendige input- og outputporte. Om n\u00f8dvendigt er disse ogs\u00e5 anf\u00f8rt p\u00e5 udbyderens supportside.<\/p>","protected":false},"excerpt":{"rendered":" POP3 wird zur \u00dcbertragung von eMails eingesetzt. Es ist die 3. Version des Post Office Protocol. Mit einem POP3-f\u00e4higen Mailprogramm k\u00f6nnen Sie Mails von einem Server abholen. Je nach Einstellung werden die Mailnachrichten nach dem Abruf auf dem Server gel\u00f6scht und danach nur noch auf Ihrem Endger\u00e4t (PC, Tablet, Smartphone oder \u00c4hnliches) gespeichert. 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af POP3 i mailprogrammet<\/h3>\n