Expand email alias domain lists

[faktas2]

Summary

Adds two newly identified alias domains so more equivalent addresses
normalize to the same value before hashing:

• fastmail.ca — Fastmail's own Canadian domain. Confirmed via MX
  records resolving to Fastmail's messagingengine.com infrastructure,
  and listed on Fastmail's official domain list.
• myyahoo.com — an alternate Yahoo-owned signup domain (WHOIS
  registrant: Yahoo Assets LLC), functionally identical to yahoo.com.

Both run on their provider's own native mail platform with no
third-party migration history, so the existing normalization logic
applies to them exactly as it does to their canonical counterparts.

This mirrors the same addition made to the minFraud web service's own
email normalization.

Testing

Added matching unit test cases following the existing pattern. Not run
locally — no Maven available in this environment — so CI should be
checked before merge.

🤖 Generated with Claude Code

Summary by CodeRabbit

• New Features

  • Added support for recognizing additional Fastmail and Yahoo email domains during address normalization.

• Bug Fixes

  • Improved normalization, domain extraction, and MD5 handling for aliases using the newly supported domains.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro Plus

Run ID: c880691d-a141-41a5-8f86-6da1daf87ec7

📥 Commits

Reviewing files that changed from the base of the PR and between d5a605e and 155ee56.

📒 Files selected for processing (2)

• src/main/java/com/maxmind/minfraud/request/Email.java
• src/test/java/com/maxmind/minfraud/request/EmailTest.java

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📝 Walkthrough

Walkthrough

The email domain allowlists now include fastmail.ca and myyahoo.com. Tests verify normalization, MD5 input, and domain extraction for addresses using those domains.

Changes

Email normalization

Layer / File(s)	Summary
Domain mappings and normalization coverage src/main/java/com/maxmind/minfraud/request/Email.java, src/test/java/com/maxmind/minfraud/request/EmailTest.java	Adds fastmail.ca and myyahoo.com to the relevant allowlists and verifies alias normalization, MD5 input, and domain extraction for both cases.

Estimated code review effort: 1 (Trivial) | ~3 minutes

Poem

I’m a rabbit with domains to sort,
Fastmail and Yahoo now join the court.
Aliases hop, hashes gleam,
Tests keep every address clean.
Satisfied ears: the mappings report!

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately summarizes the main change: expanding email alias domain normalization lists.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch expand-email-alias-domains

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