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docs/model-passwd.md

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+# Fully supported hashing methods
+
+The most current mailcow fully supports the following hashing methods.
+The default hashing method is written in bold:
+
+- **BLF-CRYPT**
+- SSHA256
+- SSHA512
+
+The methods above can be used in `mailcow.conf` as `MAILCOW_PASS_SCHEME` value.
+
+## Read-only hashing methods
+
+The following methods are supported **read only**. 
+
+- MD5-CRYPT
+- PLAIN-MD5
+- SHA512-CRYPT
+
+That means mailcow is able to verify users with a hash like `{PLAIN-MD5}1a1dc91c907325c69271ddf0c944bc72` from the database.
+
+The value of `MAILCOW_PASS_SCHEME` will _always_ be used to encrypt new passwords.
+
+---
+
+> I changed the password hashes in the "mailbox" SQL table and cannot login.
+
+A "view" needs to be updated. You can trigger this by restarting sogo-mailcow: `docker-compose restart sogo-mailcow`