Yog tias muaj, qhov siab tshaj plaws yog dabtsi?
Txawm hais tias muaj ntau hom email uas siv thaum ntxov email systems, tsuas yog ib qho yog siv tam sim no - tus paub username@example.com . Tam sim no email syntax ua raws li cov qauv hauv RFC 2821, thiab nws qhia txog tus cwj pwm txwv. Qhov siab tshaj plaws ntawm tus email chaw nyob yog 254 cim, tab sis nws muaj ntau yam tsis meej pem txog qhov teeb meem no.
Cov Ntaus Nyab Xeeb hauv Email Chaw Nyob
Txhua tus email chaw nyob muaj ob ntu. Ib sab ntawm lub zos, uas tej zaum yuav muaj kev cuam tshuam, tuaj ua ntej lub zog (qhov @ kos npe), thiab sau npe, uas tsis yog case sensitive, ua raws li nws. Hauv "user@example.com," qhov chaw hauv zos ntawm tus email chaw nyob yog "neeg," thiab sau ib feem yog "example.com."
Tag nrho ntev ntawm tus email chaw nyob hauv Ameslikas tau teev nyob rau hauv RFC 3696 los ua 320 cim. Tshwj xeeb, nws hais tias:
- Qhov chaw hauv zos ntawm tus email address-koj tus username-yuav tsis pub tshaj 64 cim.
- Lub npe no tsuas siv tau rau 255 cim xwb.
- Lub ampersand suav ua ib lub cim.
Yog tias koj ntxiv cov no, koj tuaj txog ntawm 320-tab sis tsis yog li ntawd. Muaj kev txwv hauv RFC 2821, uas tam sim no tus qauv siv, uas hais tias, "Qhov siab tshaj plaws ntev ntawm txoj kev rov qab los yog taug kev-yog 256 cim, suav nrog lub cim thiab cim cais." Ib txoj kev rau pem hauv ntej muaj ib nkawm ntawm lub kaum sab xis, ces yuav siv li ob ntawm cov cim 256, tawm qhov siab tshaj plaws ntawm cov cim koj siv tau hauv email chaw nyob ntawm 254.
Li ntawd, txwv qhov chaw hauv zos ntawm qhov chaw nyob email rau 64 lossis tsawg dua cov cim thiab txo tagnrho tus email chaw nyob rau 254 cim. Tus neeg twg uas tau siv qhov email chaw nyob yuav ntshe xav kom koj txo nws dua.
Hais txog koj lub npe
Txawm hais tias tus txheej txheem qhia meej tias lub zos qhov chaw nyob ntawm tus email yog cov ntaub ntawv rhiab, muaj ntau tus neeg xa email xav txog lub zos qhov chaw nyob ntawm email rau Jill Smith, piv txwv li, yuav tsum yog tib yam txawm tias tus username yog Jill.Smith , JillSmith los yog, nrog ntau tus kws kho mob, jillsmith .
Thaum koj xaiv koj lub username, koj tuaj yeem siv cov tsiaj ntawv A thiab Z, ib tug z, ib tug lej 0 txog 9, ib zaug xwb yog tias nws tsis yog thawj zaug lossis lub xeem cim, thiab lwm tus cim tshwj xeeb xws li! # $ % & '* + - / =? _' {|} ~.