$rcmail_config['db_dsnw'] = 'mysql://passwort1:passwort2@rdbms.strato.de/Databasename';
Passwort1 is the password I use for logging into my useraccount at my ISP and passwort2 is the password for my database. rdbms.strato.de is the server and Databasename the name of the database. Is this correct?
No that is incorrect, you should have:
mysql://UserDatabase:PasswdDatabase@SERVER/Databasename';
Instead of "rdbms.strato.de", you should have either "localhost" or "rdbms.strato.de:PORT", where PORT is the port of the database (ex 3306).
For the rest:
Checking PHP extensions
The following modules/extensions are required to run RoundCube:
PCRE: OK
Session: OK
Sockets: NOT OK
-> I don't know how to solve this...These extensions are optional but recommended to get the best performance:
FileInfo: NOT ->
Only optional, so you can make RC work without itLibiconv: OK
Multibyte: NOT AVAILABLE ->
Only optional, so you can make RC work without itOpenSSL: NOT AVAILABLE ->
Only optional, so you can make RC work without itMcrypt: OK
GD: OK
Checking available databases
Check which of the supported extensions are installed. At least one of them is required.
MySQL: OK
MySQLi: OK
PostgreSQL: NOT OK->
You only neead at least one of themSQLite (v2): NOT OK->
You only neead at least one of themCheck for required 3rd party libs
VoilÃ