I think the main reason to have the docker-mailserer image is so that one can really quickly start an email server for a couple of user accounts without being an expert in postfix/etc. And for testing sometimes pop access could be quite important. It took me a few hours to get it running; and with this page it should make it much easier for other novices.

docs/content/pop3.md

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+# Pop3 Mail access
+
+**docker-mailserver does  not think that it is  good idea to use pop.**
+
+But is you really want to you have to add 3 lines to the docker-compose.yml :  
+Add the ports 110 and 995 and add environment variable ENABLE_POP : 
+
+```
+
+maildata:
+  image: ubuntu
+  volumes:
+    - /var/mail
+  command: /bin/true
+
+mail:
+  image: "tvial/docker-mailserver"
+  hostname: "mail"
+  domainname: "domain.com"
+  volumes_from:
+   - maildata
+  ports:
+  - "25:25"
+  - "143:143"
+  - "587:587"
+  - "993:993"
+  - "110:110"
+  - "995:995" 
+
+  volumes:
+  - ./spamassassin:/tmp/spamassassin/
+  - ./postfix:/tmp/postfix/
+  - ./opendkim/keys:/etc/opendkim/keys
+  - ./letsencrypt/etc:/etc/letsencrypt
+  environment:
+  - DMS_SSL=letsencrypt
+  - ENABLE_POP3=1
+
+
+```