Refactored Mail Transport and Domain Validator (#6791)

pyte (Demian)requested to merge
Pyte/ispconfig3:6791-validator_mail_domain_transport into develop

  • Added validation to prevent conflicts between mail domains and mail transports:

    • When adding a new mail domain, the system now checks for existing mail transports with the same domain.
    • When adding a new mail transport (routing), the system verifies that no mail domain with the same domain exists.

  • Cleaned up non-functional code in the mail transport validator.

Closes #6791 (closed)

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