Mail the ticket and the muni meter receipt. No additional explanation is needed. The ticket will be dismissed.
A mini meter receipt paid for
up to 5 minutes after the ticket is issued is good.
If your ticket is more than 5 minutes old, look around/ wait around for someone going into their car and ask them for their receipt - if it covers the time of your ticket.
Post your Muni-Meter tickets here so people can fight their tickets
https://telegram.me/joinchat/BsVANT-QlTFOXaHWgV3whg