CIS 3210 Lecture Notes - Lecture 11: Simple Mail Transfer Protocol, Message Transfer Agent, Message Queue

• School: University of Guelph
• Department: Computing and Information Science
• Course: CIS 3210
• Professor: Xiaodong Lin

Document Summary

Smtp, simple mail transfer protocol - only for sending emails. Messages must be in 7-bit asci (cannot be in binary - most attachments are in binary, but will be encoded to base 64 via the email client) Http - pull, the client requests something and the server gives. Smtp - push, the client pushes a message to the mail server. Http - each object is encapsulated in its own response message. Smtp - multiple objects sent in multipart message. Authorization, download, using port 110 (non-encrypted port) by default or port. More features including manipulation of stored messages on the server, using port 143 (non-encrypted port) by default or port 993(using pop3 securely) Issue with pop - everything (including password) is passed to the server in plaintext. We need to map computer ip address and names and vice versa. General service: looking up ip address using a human readable name (and vice versa)