Verification email shows success in UI but fails with MAIL_URL error in backend

Description:

Verification email shows success in UI ("Verification email sent"), but actually fails in backend with error:

"You have not provided a mail URL"

This creates a misleading situation where the user believes the email was sent successfully, but it is not.

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Steps to reproduce:

1. Run Rocket.Chat locally using Docker
2. Configure SMTP settings in Administration → Email
3. Go to Profile → click "Resend verification email"
4. Observe success message in UI
5. Check logs using: docker logs rocketchat

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Expected behavior:

Email should be sent successfully OR an error should be displayed in the UI if sending fails.

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Actual behavior:

UI shows success message ("Verification email sent"), but backend logs show failure:

Error: You have not provided a mail URL

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Server Setup Information:

• Version of Rocket.Chat Server: 8.2.1
• License Type: Community
• Number of Users: 1 (local setup)
• Operating System: Windows (Docker Desktop)
• Deployment Method: docker
• Number of Running Instances: 1
• DB Replicaset Oplog: not configured
• NodeJS Version: 22.x (from Docker image)
• MongoDB Version: 8.0

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Client Setup Information

• Desktop App or Browser Version: Chrome (latest)
• Operating System: Windows

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Additional context

SMTP settings are configured via the admin panel, but certain email flows (like verification email) still depend on MAIL_URL internally.

This results in inconsistent behavior:

• UI indicates success
• Backend fails silently

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Relevant logs:

Error: You have not provided a mail URL
at Object.Email.sendAsync (packages/email/email.js:257:11)
at AccountsServer.Accounts.sendVerificationEmail (packages/accounts-password/password_server.js:912:5)

Start with packages/email/email.js at Object.Email.sendAsync and packages/accounts-password/password_server.js at Accounts.sendVerificationEmail, then trace the resend-verification request from the UI. Reproduce it with the documented Docker setup and inspect docker logs rocketchat; done means a failed send is surfaced in the UI or the email is sent successfully.