plesk configuration fix (qmail, dns)

i have a ubuntu virtual server with plesk, which currently hosts two small websites. the websites are running fine, but there are some problems i need fixed quickly on that server, so i'm looking for a reliable plesk expert or linux admin to connect, check and fix the issues on that server: * i only need webhosting - no incoming mail or mailboxes, no dns (i am using external dns) - so i'd like to turn those services off if possible or apply some proper configuration * outgoing mails generated by php are not sending - they stay in the queue with some qmail error messages in the logs - i need this fixed, so that mails are sent correctly