Log output

[awdeorio]

Log output to file. Change output file with -o/--output option. Rotate files. Always log when --no-dry-run causes real emails to be sent.

[jgarbers]

Just found your tool today and it fits my needs perfectly -- thanks! On this issue might it just be easier and more general to provide an option to specify a logging configuration file as readable by logging.config.fileConfig()?

[awdeorio]

Reviewing #118, which requires some simple logging, got me thinking more about this issue.

• Automatically rotate log files so that each execution of mailmerge goes to a different log file. This could generate a lot of files, so;
• Should probably log only when --no-dry-run is enabled
• Python's RotatingFileHandler might do the trick