I've spent the last couple hours searching this forum for a solution to this problem, but haven't been able to find a post that satisfactorily solve the problem. The question I have is: How do I increase the size of message accepted by the server beyond the default 10MB limit? The answers I've seen posted all boil down to the same: postconf -e 'message_size_limit = 0' (or large number of bytes in place of 0), and increase the "quota" field of the virtual user in MySQL to accomodate the larger file size. If I do that, however, Postfix stops delivering mail to my inbox. The only error I can find that pertains to this in the logs is: As soon as I remove or comment the message_size_limit line in main.cf, however, the hung up mail in the queue gets delivered. Virtual_mailbox_limit, of course, is defined by the quota field for the user in MySQL, right? So, how the heck do I tell this MTA setup that I want it to allow messages with sizes larger than 10MB? I'm stumped. Any help, even just a direction to look in, would be appreciated.