[Backend] -- Add Multi-Region/Provider Resilience for Email Delivery

[Devsol-01]

Description:
If email delivery uses a single provider, outages can break notifications and account flows. Add resilience:

• provider failover strategy
• retry policies tuned per provider
• tracking delivery status

Acceptance Criteria:

• Failover implemented.
• Tests simulate provider outage.

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[Killerjunior]

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Hi maintainer, I have read and understood the issue requirements and checked the necessary documentation. I’m confident I can work on this task effectively and deliver a proper solution.

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[Whiznificent]

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gm maintainer i will like to work on this issue

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[ValJnr-dev1]

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Hi Maintainer,

I’m a smart contract and full-stack developer and would love to contribute to this issue. I’m an experienced contributor with hands-on expertise in Rust, Soroban, Cairo, and TypeScript.

I’m passionate about building secure, scalable blockchain solutions, with a strong emphasis on writing clean and maintainable code. Based on the scope of this issue, I’m confident I can deliver a complete solution within 24 hours of assignment.

I’d greatly appreciate the opportunity to contribute and help move this forward.

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[Ebenezer199914]

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can i work on this issue

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[code-0-stella]

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[OpadijoIdris]

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Please assign to me

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[MarcusDavidG]

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I can handle this issue and will like to work on it, Please assign thank you.

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[Swayymalcolm99]

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Please maintainer can I take this?

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[chiemezie1]

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[graceshaba93]

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Hello Maintainer, I can fix this issue.

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[GiftedGiftB]

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I can get this work done in less than 30 minutes.

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[drips-wave]

Congratulations, @GiftedGiftB! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on June 30, 2026.

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