My company needs a own mail server , in that case we would like to setup opensource zimbra mail server and the problem is how to get a droplet or any cloud platform in a low cost because zimbra mail server needs minimum 8 GB of memory and it’s quiet costly for us . My question is how can we setup Zimbra server on budget cloud provider is there any special way to buy a cloud platform ?
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I would recommend using a CentOS 7 Droplet with 8GB of RAM.
Once you have your CentOS 7 Droplet, you can follow the steps from the official Zimbra documentation on how to install it on a CentOS server:
https://wiki.zimbra.com/wiki/Zimbra_Releases/8.7.0/Single_Server_Installation#Installation_Prerequisites
One thing that you need to keep in mind is that you might have to use port 587 rather than port 25 for SMTP.