Free software can be as good as, or better than, proprietary software. qmail is an example of this. However, many businesses simply cannot make any use of software for which commercial support is unavailable. To correct that deficiency, Crynwr Software sells support services for qmail.
I'm available for site visits, installation, configuration, training, phone or email consultation. My rate is $200/hour. For jobs of a fixed scope, e.g. installing qmail on a number of workstations or servers, I can quote a fixed fee.