Enhance MailService with provider resilience and delivery status trac…#1182
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…king - Added MAIL_PROVIDERS to env validation schema. - Implemented sendMailWithResilience method for retrying email delivery. - Introduced EmailDeliveryStatus for tracking email delivery attempts. - Created unit tests for MailService to validate provider fallback behavior. - Added test-mailer-types.ts for MailerModule type exploration.
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close #1134
PR Title
[Backend] Add Multi-Region/Provider Resilience for Email Delivery
PR Description
This PR improves the reliability of email delivery by introducing provider failover, retry handling, and delivery tracking for outbound mail. The change helps prevent notification and account-flow interruptions when a primary SMTP provider becomes unavailable.
What changed
MAIL_PROVIDERSto the environment validation schema in env.validation.ts.EmailDeliveryStatusto track attempts, provider selection, and final delivery outcome.Testing
cd backend && pnpm jest src/modules/mail/mail.service.spec.ts src/modules/admin/admin-users.service.spec.ts src/modules/reports/scheduled-report.service.spec.ts --runInBand