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1. You are correct - this is wrong. servers talk to each other over smtp.
2. Not really. these are both ptrotocols, but the servers that use these protocols are interfaces between mail files and email client (MUAs)
3. I don't know - what's your implementation
4. See 3
5. I don't use mutt a lot, but I think it's an MUA. Most MUAs deliver to mail servers via smtp (Outlook, etc do too)
6. I thought exim was a server (I haven't used it). Don't know what putmail is. Fetchmail is a quasi client I guess, but is specialised in that it collects mail via pop or imap and delivers it to your server via smtp
7. You're repeating yourself
8. Probably - they typically collect mail through imap or pop and deliver it to a server via smtp
9. So I'd gathered.
Think about it this way - smtp is like a postbox on the steeet - when you want your MUA (client) to deliver mail, you post the letter in the postbox (smtp). Your post office that collects the mail delivers it to the post office near the destination communicates via smtp. The postman at the other end delivers it to your letterbox via smtp. When you go out your door to collect your mail, you use pop ot imap.
If you had a postbox at your local post office, and you sent your wife/husband up to collect it, she/he would be fetchamil (sort of).
typically with imap. messages are left on the server. Typically with pop they are downloaded and not left on the server. There are a lot of other differences as well. For your MUA to communicate with raw mailfiles, it talks to a pop or imap server. If you choose to download the messages to a local follder, then the MUA manages them itself.
You both replied excellent ..... I am very much clear about the stuff . But still need some help .
billymayday ,
My setup is - > I am configuring a mail server behind a NAT . ( ip for server is 10.232.18.19 ) .I have a Gateway well configured . Any mail client from outside the network should be able to access Netwrok
I know that the information ,i Provided , is incomplete . I am in beginning stage . So you can well explain thing in a way i can understand .
If you are interested in setting up a mail server, and want an outstanding book (for Postfix), I highly recommend The Book of Postfix (http://www.postfix-book.com/)
What you havent mentioned in your configurations is the router for your LAN. You must forward ports 25 and 110 for MTA and MUA to work from anywhere. You also must have your domain dns pointing to the routable IP address of your LAN
I studied a lot and reached in a conclusion . I am looking for a stable and secure relay server on my embeded platform . The device will be on a lan in a well configured gateway .
Now , i had a great choice for servers .....But i am confused about which one should i use ?
Which is the best relay server ?
Best is the one you understand the most. Your needs sound minimal, so go with what feels most comfortable. Look at each MTAs documentation. Pick the one that feels best to you.
To start with , Can you name two or three , so that i can go through in detail . I am a slow learner , it would take days to read all those documents . So please drive me to some two or three that will suit for embeded linux ,and relay server
You don't have to read all of the documentation. Just a page or two from each to see if the general style meets your needs.
Mail servers are complex. The Sendmail reference is 1200 pages. The Book of Postfix is almost 500 pages. This should give you an idea of what you need to be prepared for.
You say you want users to connect remotely. This means you probably want TLS and SMTP AUTH. This means also picking an authentication package (cyrus, dovecot).
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