parse out names from emails

emailfromparser.py

#!/usr/bin/env python3

# this is designed to be used as part of a command line like:
# find Maildir/cur/ -type f -newermt '02/23/2019 0:00:00' | xargs ./emailfromparser.py | sort | uniq > new_emails.csv

from sys import argv, stdout, stderr
from csv import DictWriter

from email.parser import BytesHeaderParser
from email.utils import parseaddr

def main(filepaths):
    parser = BytesHeaderParser()
    csvwriter = DictWriter(stdout, ["fname", "sname", "email", "org"])
    for filepath in filepaths:
        try:
            outdict = {}
            with open(filepath, "rb") as fp:
                msg = parser.parse(fp)
                from_field = msg.get("From")
                name, outdict["email"] = parseaddr(from_field)
                try:
                    if "," in name:
                        # finance name
                        outdict["sname"], outdict["fname"] = name.split(",", maxsplit=1)
                    else:
                        outdict["fname"], outdict["sname"] = name.split(" ")
                except ValueError:
                    outdict["fname"], outdict["sname"] = name, ""
                outdict["org"] = outdict["email"].split("@", maxsplit=1)[-1]
            csvwriter.writerow(outdict)
        except Exception:
            print(f"unable to parse {filepath}", file=stderr)

if __name__ == "__main__":
    main(argv[1:])