Re: a "software-generated voicemail message"
> it won't pass mustard
The phrase is "pass muster" (from military inspections), but I find this particular eggcorn rather amusing.
Unfortunately, my first interpretation is that, for one to "pass mustard" the mustard must have been indigestible, and therefore fake - the complete opposite of the intended meaning.
Fortunately, a less scatological interpretation would be that something might "not pass [the] mustard" because it wanted the mustard all for itself, and is therefore a selfish bastard not to be associated with.