After Install: Mail not working and FTP strange

[Raffnix]

Hello,

Today I installed ISPconfig on a new Server (Debian Sarge Basic Image, then "Perfect Install" from HowTo)
I kept the given Hostname (IP.provider.tld) and installation worked well

But after starting ISPconfig. I noticed, that in the Services overview FTP-Server was offline. Restarting didn't change anything and trying to restart on the shell returned:

proftpd restart
- warning: "ProFTPD" address/port (xx.xx.xx.xx:21) already in use by "Debian"


I ignored that and pre-configured my domains (9 Clients), which are currently still running on my old server.

Then I switched one of them (including MX) to the new server (www.mydomain.tld is working OK) an created an user (web7p1)
Maildir has been created and I can access the Mailbox with Outlook Express and Uebimail. But trying to send mail with either of them results with an error:

Feb  2 18:40:34 xx-xx-xx-xx courierpop3login: LOGIN, user=web7p1, ip=[::ffff:xx.xx.xx.xx]
Feb  2 18:40:35 xx-xx-xx-xx courierpop3login: LOGOUT, user=web7p1, ip=[::ffff:xx.xx.xx.xx], top=0, retr=0, time=1
Feb  2 18:41:57 xx-xx-xx-xx postfix/smtpd[2144]: connect from localhost[::1]
Feb  2 18:41:57 xx-xx-xx-xx postfix/smtpd[2144]: NOQUEUE: reject: RCPT from localhost[::1]: 550 <sender@somedomain.tld>: Recipient address rejected: User unknown in local recipient table; from=<web7p1@mydomain.tld> to=<sender@somedomain.tld> proto=SMTP helo=<UebiMiau>
Feb  2 18:41:57 xx-xx-xx-xx postfix/smtpd[2144]: lost connection after RCPT from localhost[::1]
Feb  2 18:41:57 xx-xx-xx-xx postfix/smtpd[2144]: disconnect from localhost[::1]
Feb  2 18:45:45 xx-xx-xx-xx postfix/smtpd[2226]: connect from myip[xx.xx.xx.xx]
Feb  2 18:45:45 xx-xx-xx-xx postfix/smtpd[2226]: warning: SASL authentication failure: cannot connect to saslauthd server: No such file or directory
Feb  2 18:45:45 xx-xx-xx-xx postfix/smtpd[2226]: warning: myip[xx.xx.xx.xx]: SASL LOGIN authentication failed

On the other hand, connecting to the server with an FTP client works fine (despite of the first error)

If you can help me get my mail working and explain the ftp behaviour I would be glad