[JamesSwift]

Then you put them all in a "someday" folder and work FIFO through that. Offer a way to pay for direct solicitation. Those who pay get preferential attention, otherwise you get to it when you get to it.

[ormaaj]

Yes. Email is generally best-effort response and people need to be understanding. It's not even always the best tool for the job.

UNLESS dealing with email is your primary job responsibility. Then I would fully expect you to have your act together.