troubleshooting Question

Mail question on Linux Centos

Avatar of duncanb7
duncanb7 asked on
Email SoftwareLinuxEmail Servers
7 Comments3 Solutions580 ViewsLast Modified:
Dear Experts,
I attach port definition from wiki,
Dear Experts,

1-What is major different between SMTP, POP3, IMAP ?

2- What is major different between SMTP, SENDMAIL, PSOTIX ?

3-We always see the word of POP3 is sticked with IMAP, and
STMP is sticked with POSTIX and SENDMAIL, why those are so related ?

4-I know squirrelmail is toll to display email only, but why squirrelmail tools
will know to connect /home/mylogin/mail directory and the email folder ?
I try to copy the email in such directory, for example, support email folder
in /home/myloginmail to new folder such as supportnew but squirrel too
doesn't include supportnew folder. Why ? Whether POP3/IMAP
need to take care all setup for email folder directory so squirrel tools
will get it correctly. How to make sure the tool could also include supportnew
folder. I know I can do it in cpanel, but I had no longer to use it .

Those question reply  is no need as research reports just a brief or idea to let me going into right direction but need a key word to explain it .

Please advise

Duncan


20 & 21: File Transfer Protocol (FTP)
22: Secure Shell (SSH)
23: Telnet remote login service
25: Simple Mail Transfer Protocol (SMTP)
53: Domain Name System (DNS) service
80: Hypertext Transfer Protocol (HTTP) used in the World Wide Web
110: Post Office Protocol (POP3)
119: Network News Transfer Protocol (NNTP)
143: Internet Message Access Protocol (IMAP)
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