Postfix file locking stops simultaneous user access
 

I have a simple (home) postfix environment which runs very reliably.

I have three clients all requiring access to the same user account. Theses are my home machine, laptop, and work machine. All run disconnected Imap.

However, as one machine connects to Postfix, the server drops the session from the others. On looking into this it appears that it is a function of the Linux file locking system but I cannot find how to get around it.

Any assistance is appreciated.

David