[SOLVED] SMTP protocol ..

I would like to setup a mail server behind a NAT . User should be able to connect to the mail server from anywhere.

I am new to these but learning hard . I want security to all email communications .

i need clarification on following .....please

1) All email clients and servers run on smtp protocol ? { i think it is wrong for eg : pop3 )

2) POP3 and IMAP are email servers as well as clients .

3) For my implementation ,i can use any emil server based on smtp ...lile sendmail ,qmail ,postfix ,IMAP etc .......

4) For my implementation i can use any emil client .

5) mutt is an email client based on smtp

6) exim ,putmail ,fetchmail are also email client .

7) mutt ,exim ,pop3 are email clients .

8) All clients also use smtp protocol

9) I am very confused about POP3 and IMAP ...where they belong ? in server ,client or email retrieval tool .


Any help or clue is really appreciated ,

Thanks,

Quote:

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Originally Posted by 91change

I would like to setup a mail server behind a NAT . User should be able to connect to the mail server from anywhere.

I am new to these but learning hard . I want security to all email communications .

i need clarification on following .....please

1) All email clients and servers run on smtp protocol ? { i think it is wrong for eg : pop3 )

2) POP3 and IMAP are email servers as well as clients .

3) For my implementation ,i can use any emil server based on smtp ...lile sendmail ,qmail ,postfix ,IMAP etc .......

4) For my implementation i can use any emil client .

5) mutt is an email client based on smtp

6) exim ,putmail ,fetchmail are also email client .

7) mutt ,exim ,pop3 are email clients .

8) All clients also use smtp protocol

9) I am very confused about POP3 and IMAP ...where they belong ? in server ,client or email retrieval tool .


Any help or clue is really appreciated ,

Thanks,

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first decide what types of your email server you wanted? is it SMTP or POP3? the diff between to of them:
SMTP, email will be placed in server; user just read it
POP3, email will be placed in client computer, not in server

if you would like to choose SMTP, you can use postfix as SMTP server, dovecot as IMAP server and squirrelmail as email client. squirrelmail is web-based email client.
if you would like to choose POP3, you can use postfix as your POP3 server and kmail or thunderbird or evolution as email client

I would like to implement only a smtp relay server on my linux embeded platform . My gateway is well configured to work with all clients outside my LAN .

Can you please suggest best relay server ? . I am looking for a powerful ,thin and secure relay server . This relay server should queue mails once offline and sends till sucess on becoming online ,.