The configuration file contains the % character. Python's configparser module uses string interpolation by default, and % is treated as interpolation syntax.
Updated ....\imapbox-master\imapbox.py with 1 addition and 1 removal
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11 def load_configuration(args):
12 - config = configparser.ConfigParser(allow_no_value=True)
12 + config = configparser.ConfigParser(allow_no_value=True, interpolation=None)