Change fastMail to use forDomain instead of url

[Hinton]

Type of change

- [x] Bug fix
- [ ] New feature development
- [ ] Tech debt (refactoring, code cleanup, dependency upgrades, etc)
- [ ] Build/deploy pipeline (DevOps)
- [ ] Other

Objective

It seems the web clients use forDomain instead of url for website. This changes the SDK to send the same values.

Before you submit

• Please add unit tests where it makes sense to do so

[github-actions]

Checkmarx One – Scan Summary & Details – 94876a11-089b-480a-bd70-082c59b781b5

No New Or Fixed Issues Found

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 60.77%. Comparing base (b4205cc) to head (cdb8aaf).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #707   +/-   ##
=======================================
  Coverage   60.77%   60.77%           
=======================================
  Files         173      173           
  Lines       10608    10608           
=======================================
  Hits         6447     6447           
  Misses       4161     4161           

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