Requirements:

1.php sends 800,000 emails every day (almost 10 emails per second). Now we need to use the message queue. Example scenario (pictured): Server A is used as the exit. Deliver the email to the sending server

2. Just meet the needs. There is no need to use a heavyweight product, just be suitable.

Do you recommend redis, RabbitMQ or others?

If you use redis, which one should you use? Send/subscribe or list lpush rPop?

Please tell me your reasons and usage in general or in detail, thank you