The solution is to implement a local queue to store failed emails when QUEUEMAIL.DEV does not respond.
Hardy client example shows you how to implement this local queue.
QUEUEMAIL.DEV servers implement protections against brute force or DDoS attacks so it is a good idea to space out your API requests by at least 1 second. No problem if you make more requests in 1 second, the protection system evaluates other parameters to find out if it is an attack or a normal use API but in any case we recommend that you always implement a robust sending with local queue so that if at any moment your source IP is temporarily banned, local queue will take care to retry pending emails.
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With free tier:
- You can use a SMTP server from your own domain and you can send without problems using addresses from that domain.
Or..
- Some SMTP servers like Gmail/Google allows you to send emails using your email address. Follow the instructions for each SMTP server to set up sending with your custom domain.
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With profesional custom Queuemail SMTP servers: We will send you instructions to make domain DNS zone changes in order you can send emails using your custom domain.