POP3 is one of two e-mail inbox protocols (POP3: Post Office Protocol version 3; IMAP: internet Message Access Protocol). SMTP (Simple Mail Transfer Protocol) is used in conjunction with either POP3 or IMAP to allow users to send e-mail addresses as well as receive them. Most web-based e-mail services does this transparently behind their networks and present a fancy UI for users to access their e-mail inboxes. However, you can opt to enable IMAP/POP3 + SMTP if you wish to not have to open up a Web browser every time you want to look at your e-mails, and use a dedicated e-mail program instead (i.e. Microsoft Outlook or Mozilla Thunderbird)
FTP is a file transfer protocol as send the file inside the network but SMTP is send the email inside the nework (as use mailing perose), or ftp and smtp supported for iis.
smtp is a mailing protocol used in emails while ftp is a protocol used to upload or download afile from the internet.
SMTP Service Ready
Layer 7, Aplication
Ftp and smtp ( simple mail transfer protocol)
Application Layer 7
Using FTP, TELNET, SNMP, SMTP etc we can share resources in computer networking.
80 is HTTP, 25 is SMTP and 20/21 are used for FTP.
rfc821 is for SMTP rfc822 is for mail message format..
SMTP and POP are two of the three methods for handling email. POP stands for Post Office Protocol and allows you to download email from a server, and SMTP which stands for Simple Mail Transfer Protocol, allows you to send email.
FTP; HTTP; DNS (uses both TCP and UDP); several e-mail protocols including POP3, SMTP, IMAP4.
Automation file synchronization over LAN and WAN, FTP, HTTP, SMTP, POP3, PING. File
There are many more than three protocols which can operate at the application layer. Some of these are; Telnet FTP TFTP SMTP IMAP POP DNS RARP BOOTP SNMP CMOT
UDP: DNS, TFTP, DHCP... TCP: SMTP, HTTP, HTTPS, DNS, FTP, SHH, Telnet...