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Updated A mail server's 101 (markdown)

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Jean-Denis Vauguet 2020-06-12 05:57:55 +02:00
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@ -85,22 +85,21 @@ When it comes to the specifics of email exchange, we have to look at protocols a
| Retrieval | IMAP4 | 143 (encrypted using STARTTLS) + 993 (TLS) |
| Retrieval | POP3 | _Not activated_ |
If you're new to the field, that table may be confusing.
Read on to gain insights about docker-mailserver's configuration and how you may customize it.
On a final note, here's what docker-mailserver's default configuration provides you with (feel free to skip this schema for now):
```txt
┏━━━━━━━━ Submission ━━━━━━━━┓┏━━━━━━━━━━━━ Transfer/Relay ━━━━━━━━━━━━┓
┌────────────────────┐ ┌┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┐
Sending an email: MUA --- STARTTLS --> ┤(587) MTA ╮ (25)├ <-- plain text --> ┊ Third-party MTA ┊
|┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄| └┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┘
Fetching an email: MUA <-- STARTTLS --- ┤(143) MDA ╯ |
<---- TLS ------ ┤(993) |
└────────────────────┘
┗━━━━━━━━━ Retrieval ━━━━━━━━━┛
┏━━━━━━━━━━ Submission ━━━━━━━━━┓┏━━━━━━━━━━━━━ Transfer/Relay ━━━━━━━━━━━┓
┌─────────────────────┐ ┌┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┐
Sending an email: MUA ----- STARTTLS ---> ┤(587) MTA ╮ (25)├ <-- plain text --> ┊ Third-party MTA ┊
---- plain text --> ┤(25) │ | └┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┘
|┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄|
Fetching an email: MUA <---- STARTTLS ---- ┤(143) MDA ╯ |
<-- enforced TLS -- ┤(993) |
└─────────────────────┘
┗━━━━━━━━━━ Retrieval ━━━━━━━━━━┛
```
If you're new to the field, both that table and schema may be confusing.
Read on to gain insights about all those concepts, docker-mailserver's configuration and how you could customize it.
### Submission - SMTP
A MUA willing to send an email to a MTA needs to establish a connection with that server, then push data packets over a network that both the MUA (client) and the MTA (server) are connected to. The server implements the [SMTP](https://en.wikipedia.org/wiki/Simple_Mail_Transfer_Protocol) protocol, which makes it capable of handling _Submission_.