There was a math error in mail's implementation in the economy SS when I switched it over to delta_time, so that basically the time-based define MAX_MAIL_PER_MINUTE was being multiplied by delta_time. Just one problem, delta_time was being considered in deciseconds as usual, but my chimp brain failed to recognize that, meaning that the maximum amount of mail arriving on station was around 100x more than expected.
This corrects the delta_time variable to think in terms of MINUTE time defines, not just a static decimal multipliers.
Junk mail is funny and good, but you'll never read any of these if you get 200+ letters every shift just like it.
Additionally, adds some fluff text to the examine_more of letters, to let players know that you can use destination taggers to sne and distribute letters once they arrive.
QOL tweak is just to make cargo players and in-game purists lives easier.
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