Skip to content

Update 01-email-system.md (Delivery, Retrieval, grammar...) #1320

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Merged
merged 6 commits into from
Jul 6, 2023
Merged

Update 01-email-system.md (Delivery, Retrieval, grammar...) #1320

Changes from 5 commits
Commits
Show all changes
6 commits
Select commit Hold shift + click to select a range
67599e7
Update 01-email-system.md (Delivery, Retrieval, grammar...)
SergeCroise Jul 3, 2023
0313bb9
Update 01-email-system.md (punctuation: etc.)
SergeCroise Jul 3, 2023
cc61246
Update 01-email-system.md (add an empty line after question)
SergeCroise Jul 4, 2023
147f3f0
Update 01-email-system.md (add an empty line after question)
SergeCroise Jul 4, 2023
51a6f81
Update 01-email-system.md (concrete realization: 3 lines)
SergeCroise Jul 4, 2023
9841e05
Update docs/guides/email/01-email-system.md
wsoyinka Jul 6, 2023
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
21 changes: 10 additions & 11 deletions docs/guides/email/01-email-system.md
View file
Open in desktop
Original file line number Diff line number Diff line change
@@ -1,7 +1,6 @@
---
title: Overview of email system
author: tianci li
update: 2023-06-19
version: 1.0.0
---

Expand All @@ -17,8 +16,8 @@ The E-mail system mainly consists of four parts: **MUA**, **MTA**, **MRA** and *

* **MUA (Mail User Agent)**: That is, mail clients for users, such as Outlook, Foxmail, etc.
* **MTA (Mail Transfer Agent)**: Refers to an e-mail server program that is used to transmit mail. The MTA is the implementation of SMTP.
* **MDA (Mail Deliver Agent)**: When the MTA receives the mail, the MDA is responsible for saving the email to the designated location on the email server, while also performing email filtering and antivirus operations.
* **MRA (Mail Recelve Agent)**: The MRA is an implementation of IMAP and POP3, used to interact with MUA and transmit emails to email clients through IMAP or POP3.
* **MDA (Mail Delivery Agent)**: When the MTA receives the mail, the MDA is responsible for saving the email to the designated location on the email server, while also performing email filtering and antivirus operations.
* **MRA (Mail Retrieval Agent)**: The MRA is an implementation of IMAP and POP3, used to interact with MUA and transmit emails to email clients through IMAP or POP3.

### Three protocols

Expand All @@ -30,7 +29,7 @@ The difference between IMAP and POP3 is as follows:

| Operating position | Operation content | IMAP | POP3 |
| :---: | :---: | :---: | :---: |
| Inbox | Reading, tagging, moving, deleting emails, etc | Client synchronizes with mailbox updates | Within the client only |
| Inbox | Reading, tagging, moving, deleting emails, etc. | Client synchronizes with mailbox updates | Within the client only |
| Outbox | Save to Sent Mail | Client synchronizes with mailbox updates | Within the client only |
| create folder | Create a new custom folder | Client synchronizes with mailbox updates | Within the client only |
| draft | Save Draft Email | Client synchronizes with mailbox updates | Within the client only |
Expand All @@ -43,12 +42,12 @@ As shown in the picture below, this is a simple illustration of the sending and

![Simple email system](./email-images/email-system01.jpg)

MTA: In GNU/Linux, the mainstream and common MTA are **postfix**,**qmail**, **sendmail**
MDA: In GNU/Linux, the mainstream and common MDA are **procmail** and **maildrop**
MRA: In GNU/Linux, the mainstream and common MDA are **dovecot**
* **MTA**: In GNU/Linux, the mainstream and common MTA are **postfix**,**qmail**, **sendmail**.
* **MDA**: In GNU/Linux, the mainstream and common MDA are **procmail** and **maildrop**.
* **MRA**: In GNU/Linux, the mainstream and common MDA are **dovecot**.

!!! question
Why is DNS required to participate in the work of the email system?
!!! question "Why is DNS required to participate in the work of the email system?"

In daily use, the standard format for an email user is "username@domain name". A domain name cannot represent a specific host, you need to point the domain name to a specific host name, so we need a DNS MX resolution record.

## Postfix The process of sending and receiving emails
Expand All @@ -68,7 +67,7 @@ For more information about postfix, please refer to these two links:

![legend01](./email-images/email-system02.jpg)

Postfix determines whether a emails sent from a client belongs to the local or external domain. If it belongs to the local domain, the emails will be stored to the mail box in the local domain. If the email sent belongs to an external domain, it is forwarded to another MTA (the user's identity needs to be verified from the database before forwarding).
Postfix determines whether an email sent from a client belongs to the local or external domain. If it belongs to the local domain, the email will be stored in the local domain mailbox. If the email sent belongs to an external domain, it is forwarded to another MTA (the user's identity needs to be verified from the database before forwarding).

### The process of receiving emails by the client

Expand All @@ -86,4 +85,4 @@ A complete email system consists of components that are decentralized and mainta
* [Kolab Groupware](https://docs.kolab.org/installation-guide/index.html)
* [squirrelmail](https://www.squirrelmail.org/index.php)
* [hmailserve](https://www.hmailserver.com/)
* ...
* ...