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+#!/usr/bin/env python3
+
+# Challenge 062
+#
+# TASK #1 > Sort Email Addresses
+# Submitted by: Neil Bowers
+# Reviewed by: Ryan Thompson
+#
+# Write a script that takes a list of email addresses (one per line) and sorts
+# them first by the domain part of the email address, and then by the part to
+# the left of the @ (known as the mailbox).
+#
+# Note that the domain is case-insensitive, while the mailbox part is case
+# sensitive. (Some email providers choose to ignore case, but that's another
+# matter entirely.)
+#
+# If your script is invoked with arguments, it should treat them as file names
+# and read them in order, otherwise your script should read email addresses from
+# standard input.
+#
+# Bonus
+# Add a -u option which only includes unique email addresses in the output, just
+# like sort -u.
+#
+# Example
+# If given the following list:
+#
+# name@example.org
+# rjt@cpan.org
+# Name@example.org
+# rjt@CPAN.org
+# user@alpha.example.org
+# Your script (without -u) would return:
+#
+# user@alpha.example.org
+# rjt@cpan.org
+# rjt@CPAN.org
+# Name@example.org
+# name@example.org
+# With -u, the script would return:
+#
+# user@alpha.example.org
+# rjt@CPAN.org
+# Name@example.org
+# name@example.org
+
+import sys
+from getopt import getopt
+
+opt_u = False
+opts, args = getopt(sys.argv[1:], 'u')
+for o, a in opts:
+    if o == '-u':
+        opt_u = True
+
+mails = [line.strip() for line in sys.stdin]
+
+sorted_mails = sorted(
+    map(lambda x: [x] + x.split('@'), mails),
+    key=lambda x: (x[2].lower(), x[1])
+)
+
+if opt_u:
+    seen = set()
+    sorted_mails = [
+        [f"{mail[0]}"]
+        for mail in sorted_mails
+        if (key := f"{mail[1]}@{mail[2].lower()}") not in seen and not seen.add(key)
+    ]
+
+print("\n".join([x[0] for x in sorted_mails]))