Update Readme

README.md

@@ -20,13 +20,14 @@
 * `abra app new pretix --secrets`
 * `abra app config <app-name>`
 * `abra app deploy <app-name>`
+* If you get an internal server error, try running `pretix migrate` inside the app container
 
 For more, see [`docs.coopcloud.tech`](https://docs.coopcloud.tech).
 
 
 ## TODO
 
-* [ ] mail
+* [X] mail
 * [ ] healthchecks
 * [ ] cronjob: 15,45 * * * * /usr/bin/docker exec pretix.service pretix cron
 * [ ] backups https://docs.pretix.eu/en/latest/admin/maintainance.html#maintainance