USACE, Civil Works, internal controls included procedures to identify and address improper. payments and ensured that disbursements were accurate and timely. Specifically, the controls. for commercial, Temporary Duty (TDY), Permanent Change in Station (PCS), and credit card.
What are email Protocols?â Email protocols are the rules and procedures for sending and receiving email. The main protocols you will encounter on the Internet are POP3, IMAP4 and SMTP. The Internet email protocols are single function protocols i.e. they do a single job. The POP3 and IMAP4 protocols are for receiving or fetching email from an email server. Whereas the SMTP protocol is used for sending emails between email servers, and also for sending email between an email client and server. Internet email protocols are text-based protocols, and use a command/response type format, as they were initially used from a command prompt.
This chapter reviews modern email protocols in use today and some of the programs designed to send and receive email. Today, email is delivered using a client/server architecture. An email message is created using a mail client program. This program then sends the message to a server. The server then forwards the message to the recipient's email server, where the message is then supplied to the recipient's email client.