This document summarizes key components of an email server including the mail server port (Port 25), common mail clients (Thunderbird, Outlook, Evolution, Kmail, IBM Lotus Notes), webmail clients (Horde, Open webmail, SquirelMail, Roundcube), and how mail servers work. It describes outgoing servers using SMTP and MSA protocols looking up MX records from DNS servers. It also discusses incoming servers using POP3 and IMAP4 protocols, with POP3 requiring downloading all emails to PCs while IMAP4 keeps emails on the server. Finally, it lists the main protocols and ports used including POP3 (Port 110), IMAP4 (Port 143), SMTP (Port 25

1. MAIL SERVER

2. Email Server
Port 25

3. MAIL CLIENTS
A Computer program use to access and manage
Users mail.
1.Thunder bird
2.Outlook
3.Evalution
4.Kmail
5.IBM Lotus Note

4. WEBMAIL CLIENTS
1.Horde
2.Open webmail
3.SquirelMail
4.Roundclube

5. How mail servers
work?

6. Outgoin
g Server
Client
Server
OUTGOING SERVERS – (SMTP/MSA PROTOCOL)

7. Outgoin
g Server
Client
Server
Mail
Directoryme B
C D
•It using SMTP , MSA protocol.
•In this process looking MX Record from DNS Server
OUTGOING SERVERS – (SMTP/MSA PROTOCOL)

8. INCOMING SERVER
POP3 IMAP4
Since email needs to be downloaded
into desktop PC before being displayed,
you may have the following problems
for POP3 access:
You need to download all email
again when using another desktop PC
to check your email.
May get confused if you need to check
email both in the office and at home.
downloaded email may be deleted
from the server depending on the
setting of your email client.
Since email is kept on server, it would
gain the following benefits for IMAP
access:
No need to download all email when
using other desktop PC to check your
email.
Easier to identify the unread email.
Example: mail.sfn.ac.lk

9. PROTOCOL IN MAIL SERVER
PROTOCOL USE PORT
POP3 Incoming mail server 110
IMAP4 Incoming mail server 143
SMTP Outgoing server 25
MSA Outgoing server 587
HTTP Webmail