I-imeyili ethunyelwe nge-VPN: impendulo iya ngempela kuphi

Uthumela umlayezo ngomhubhe, unqamula uxhumano, futhi impendulo ifika ngakusasa ekuseni. Akukho kulokho okudinga ikheli le-VPN elidala, futhi akukho okonakalayo. I-imeyili ayiqondisi izimpendulo ekhelini okuthunyelwe kulo umlayezo; iziqondisa ebhokisini leposi. Lapha izindlela ezintathu zihlangana zibe umbuzo owodwa, futhi ukuzihlukanisa kuphendula ingxenye enkulu yokukhathazeka.

Izindlela ezintathu abantu bazihlanganisa zibe yinye

Ukuthunyelwa, ukulethwa nokufunda kuxhumano oluthathu olwehlukene, futhi kubalwa okubili kuphela okuhilela idivayisi yakho.

Submission: your mail app  -> your mail service
Delivery:   other mail service -> your mailbox service
Reading:    your app now -> your mailbox service

I-VPN ingathinta eyokuqala neyokuthathu, ngoba leyo yizixhumanisi ezenziwa idivayisi yakho. Ayikwazi ukuthinta eyesibili, ngoba leyo ndlela ihamba phakathi kwabeseva be-imeyili ababili ongalawuli. Impendulo akuyona iphakethe elibuyela ekhelini obethumele usuka kulo. Umlayezo omusha othunyelwa isevisi ye-imeyili yohlangothi olunye ebhokisini lakho leposi.

Uma ugcina lezi zintathu zihlukene, umbuzo wokuthi impendulo iyokuthola yini awuseyona imfihlakalo.

Inkambu ye-Reply-To iyikheli, hhayi indlela

I-RFC 5322 ichaza i-Reply-To njengebhokisi leposi noma amabhokisi eposi okufanele kuthunyelwe kuwo izimpendulo. Ngaphandle kwalo, okujwayelekile okuzenzakalelayo ibhokisi le-From, ngaphandle uma umuntu ophendulayo ebhala okunye. Kokubili amakheli e-imeyili asesihlokweni. Akukho okukodwa okuwumyalo wokuvula kabusha uxhumano lwenethiwekhi olwathumela umlayezo wokuqala.

Yingakho ikheli lokuphuma le-VPN lingaveli ndleleni yempendulo. Ngisho noma iseva yokuthumela yalibhala endaweni ethile lelo kheli lokuphuma, impendulo ibhaliselwa ibhokisi leposi, futhi iseva ethumelayo ibheka umshintshi we-imeyili wesizinda esikhundleni sesokhethi lakho elidala.

Uma impendulo iya endaweni engalindelekile, funda i-Reply-To nezilungiselelo zeklayenti zomthumeli ngokwakhe ngaphambi kokusola umhubhe.

Yini erekhodwa ngempela izihloko zokulandelela

Njalo ukugxuma kwe-SMTP kwengeza isihloko se-Received ngaphambili esichaza uxhumano olusingathiwe, futhi esiphezulu kakhulu ukugxuma kokugcina ngaphambi kokulethwa. Ngakho umlayezo othunyelwe ungaba nemininingwane yenethiwekhi efanele ukubuyekezwa, futhi leyo mininingwane ibhalwa amaseva, hhayi wena oyikhethayo. Okuqukethwe yikho kuncike ekwakhiweni kokuthumela komhlinzeki nendlela aphatha ngayo izihloko.

Zifunde esikhundleni sokuqagela, kusukela kumlayezo ogciniwe:

grep -E '^(Received|Return-Path|Reply-To|From):' message.eml

Isiyalo esiwusizo ukuthola ukuthi iyiphi isevisi ethembekile eyengeza inkambu ngayinye. Umbhalo ongenasizathu ngaphambili esigabeni sezihloko awuwona ubufakazi obuthembekile, futhi igama lomkhiqizo alisosifungo saphakade sokuthi ikheli lakho lasekhaya likhona njalo noma alikho njalo.

Ukufunda i-imeyili kamuva uxhumano olusha

Uma uvula impendulo, iklayenti lakho lixhumana nesevisi yakho yebhokisi leposi ngenethiwekhi okuyo manje. Lokhu uxhumano olusha olunekheli lalo lomthombo, hhayi ukuqhubeka kwesokhethi yokuthumela yayizolo. Lulandela inqubomgomo yamanje yenethiwekhi oyisebenzisayo ngaleso sikhathi.

Okuqukethwe okukude kungenye into yesithathu. Iklayenti le-imeyili elilayisha isithombe esikude noma elilandela isixhumanisi lenza isicelo esihlukile ngaphansi kwezilungiselelo zalo zamanje, futhi leso sicelo singathwala noma yiziphi izikhombisi umlayezo ozifakile. Akusona impendulo ye-SMTP efika ekhelini elidala, futhi ukuyithatha njengayo kufihla ukuchayeka kwangempela.

Cisha okuqukethwe okukude uma ufuna ukufunda umlayezo ngaphandle kokumemezela ukuthi uwuvulile.

Yini okufanele uyihlole ngaphambi kokuyibiza ngokuthi ukuvuza

Qala ngombono womlayezo wokuqala kanye nenkambu ye-Reply-To. Bese uthola ukuthi iyiphi isevisi eyengeza okufakiwe kwe-Received okukukhathazayo, futhi uqhathanise nalokho nemibhalo yamanje yomhlinzeki esikhundleni sempendulo endala yeforamu.

Ekugcineni, hlukanisa imibuzo: yini eyabonwa iseva yokuthumela, yini eyengezwa uchungechunge lokulethwa, futhi yini eyacelwa iklayenti lakho ngesikhathi uvula umlayezo?

Ukuphendula lezi zintathu ngokuhlukene kungumsebenzi omkhulu kunokuhlola ikhasi le-IP, futhi iyona kuphela indlela ekhiqiza isiphetho ongayivikela. Ukuphendula ikheli le-imeyili akuvezi ikheli lakho lasekhaya, futhi akudingi ukuthi umhubhe wakudala uhlale uvulekile.