Postfix email server, using mysql for mynetworks

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http://serverfault.com – I have my own server, with postfix as mailserver. My clients have to be able to use this mailserver as well. They use software written in c# to send emails, but since my last upgrade the smtp authentication doesn't work properly so I have to use the myNetwork setting in main.cf For dynamically allocated IP adresses, or employees of my clients working from home, this gives the problem that I have to manually adjust the main.cf everytime a mail is rejected by the mail server. I allready use MySQL for users and domains so the configuration should be OK: virtual_mailbox_domains = mysql:/etc/post (HowTos)