Simple Mail Transfer Protocol (SMTP) proxy kya hai? Explained in simple Hindi

Simple Mail Transfer Protocol (SMTP) ek communication protocol hai jo emails ko ek server se doosre server tak bhejne ke liye use hota hai. Ye protocol internet par emails ko send aur receive karne ke process ko define karta hai.

Yeh protocol mostly email clients aur servers ke beech interaction ke liye use hota hai. Jab aap apne email client (jaise Outlook, Gmail, Thunderbird) se email bhejte ho, to SMTP ka istemal hota hai us email ko aapke email server tak pahunchane ke liye, jo phir recipient ke server tak us email ko forward karta hai.

SMTP ke kuch key points:

1. Sending Emails : SMTP primarily emails send karne ke liye use hota hai. Receiving ke liye IMAP ya POP3 protocols use hote hain.
2. Port Numbers : SMTP ke liye commonly ports 25, 465 (secure SMTP over SSL), aur 587 (submission) use hote hain.
3. Commands : SMTP server aur client ke beech kuch commands exchange hote hain jaise HELO/EHLO, MAIL FROM, RCPT TO, DATA, etc., jo communication process ko manage karte hain.
4. Relay Functionality : SMTP servers ek doosre se emails relay kar sakte hain jab tak email apne final destination par pahunch jaye.

SMTP ka basic purpose email transmission ko simple, reliable, aur standardized banana hai, taaki worldwide different systems ek doosre ke sath effectively communicate kar sakein.