Bump mailsuite to >=2.2.1 (release 10.0.2)

[seanthegeek]

Summary

Patch release 10.0.2 bumping the mailsuite requirement from >=2.2.0 to >=2.2.1.

mailsuite 2.2.1 raises the transitive mail-parser floor to >=4.2.1, which pulls in two upstream fixes:

1. Phantom empty-address fix. mail-parser 4.2.1 stops returning a phantom ('', '') entry for absent address headers (Cc, Bcc, Reply-To, etc.) instead of an empty list. parsedmarc reads the mail-parser object directly through its own parse_email(), so this phantom flowed straight into output: an empty {address: ""} Cc/Bcc entry was indexed for every DMARC failure-report sample in Elasticsearch/OpenSearch, and emitted in JSON/S3/Kafka output.
2. CVE-2023-27043 hardening. mail-parser 4.2.1 also adopts the stricter address parsing that hardens against CVE-2023-27043 (CVSS 5.3) — a Python email-module flaw where an RFC 2822 header containing a special character has the wrong portion identified as the addr-spec, which can let a crafted address bypass email-domain verification.

Verification

Upgraded the venv to mailsuite 2.2.1 / mail-parser 4.2.1 and re-parsed every sample in samples/failure/:

field	before (mail-parser 4.1.4)	after (4.2.1)
cc	[{"address": "", ...}]	[]
bcc	[{"address": "", ...}]	[]

Full test suite passes against the upgraded dependency (313 passed).

Out of scope (tracked separately)

• Reply-To always empty for failure samples — a hyphen-vs-underscore key mismatch in parsedmarc's own parse_email() (reply_to vs mail-parser's reply-to), not an upstream issue. The mail-parser bump does not address it.
• Failure dashboards — Splunk RUF dashboard renames the wrong field paths; the OpenSearch RUF "reply_to" column aggregates the In-Reply-To threading header instead of the Reply-To address.

🤖 Generated with Claude Code

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.58%. Comparing base (3f64e30) to head (9934a8e).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #783   +/-   ##
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  Coverage   85.58%   85.58%           
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  Files          17       17           
  Lines        4633     4633           
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  Hits         3965     3965           
  Misses        668      668           

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