Protocols
Older models for architecture and sizing generally based everything on Post Office Protocol (POP) and Simple Mail Transfer Protocol (SMTP) only. POP was for retrieving mail, and SMTP was for transferring mail between systems. Prior to POP, there was no protocol even to read email; rather, email clients like Pine and electronic mail (elm) really just browsed the inbox directly via the Network File Server (NFS) or the file system. These were typically sized as generic or lightweight interactive logins.
Today, Internet Message Access Protocol (IMAP) and web mail have taken over POP in enterprise accounts, and while SMTP is still the transfer protocol, other transfer protocols such as Short Messaging Service (SMS) for pagers and PDAs have ...
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