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chore: Clarify exposed ports section on README

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Brennan Kinney 2020-04-27 18:23:32 +12:00 committed by GitHub
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@ -125,15 +125,19 @@ Your config folder will be mounted in `/tmp/docker-mailserver/`. To understand h
`restart: always` ensures that the mail server container (and Filebeat/ELK containers when using the mail server together with ELK stack) is automatically restarted by Docker in cases like a Docker service or host restart or container exit.
#### Exposed ports
* 25 receiving email from other mailservers
* 465 SSL Client email submission
* 587 TLS Client email submission
* 143 StartTLS IMAP client
* 993 TLS/SSL IMAP client
* 110 POP3 client
* 995 TLS/SSL POP3 client
`Note: Port 25 is only for receiving email from other mailservers and not for submitting email. You need to use port 465 or 587 for this.`
| Protocol | Opt-in Encryption<sup>1</sup> | Enforced Encryption | Purpose |
|----------|-------------------------------|---------------------|----------------------|
| SMTP | 25 | N/A | Transfer<sup>2</sup> |
| ESMTP | 587 | 465<sup>3</sup> | Submission |
| POP3 | 110 | 995 | Retrieval |
| IMAP4 | 143 | 993 | Retrieval |
1. A connection *may* be secured over TLS when both ends support `STARTTLS`. On ports 110, 143 and 587, `docker-mailserver` will reject a connection that cannot be secured. Port 25 is [required](https://serverfault.com/questions/623692/is-it-still-wrong-to-require-starttls-on-incoming-smtp-messages) to support insecure connections.
2. Receives email and filters for spam and viruses. For submitting outgoing mail you should prefer the submission ports(465, 587), which require authentication. Unless a relay host is configured, outgoing email will leave the server via port 25(thus outbound traffic must not be blocked by your provider or firewall).
3. A submission port since 2018, [RFC 8314](https://tools.ietf.org/html/rfc8314). Originally a secure variant of port 25.
See the [wiki](https://github.com/tomav/docker-mailserver/wiki) for further details and best practice advice, especially regarding security concerns.
##### Examples with just the relevant environmental variables: