To ensure reliability during outages or temporary API downtimes, we recommend implementing a local queue that stores emails and retries them later when the service is back online.
You can see a practical implementation of this in the
👉 Hardy Client Example
QUEUEMAIL.DEV uses built-in protections against brute force and DDoS attacks.
- While it’s generally safe to make more than one request per second, we recommend spacing out your requests by at least 1 second.
- The system analyzes various parameters to distinguish normal usage from potential abuse.
Best practice:
Always implement a robust sending mechanism with a local queue.
If your IP gets temporarily blocked, the local queue will automatically retry sending the pending emails.
You have two options:
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Use your own SMTP server for your domain — you can freely send emails using addresses from that domain.
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Use third-party SMTP providers (like Gmail/Google) that support custom "From" addresses.
Follow their specific configuration instructions to enable sending from your domain.
With a custom plan using Queuemail’s professional SMTP servers, you’ll receive instructions for configuring your domain’s DNS settings (e.g., SPF, DKIM, DMARC).
This allows you to send authenticated emails from your custom domain with full compliance.