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postfix high availability and scalability

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i have successfully set up a postfix , dovecot , mysql container .i can receive and send emails through this container and every thing is going alright.now i am thinking about high availabilty and scalabilty.how to build a high available postfix , dovecot and mysql dockerized system? and how to scale up this system ?

Thanks

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It's premature to talk about HA, etc; come back after you have sent 10K emails. By then you will have some feel for the scaling needed. Also, dba.stackexchange.com is a better place for MySQL discussions.
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