How can I Use Postfix as Local SMTP Mac OS X to use the Discourse One-Click Application on DigitalOcean?
If it’s possible would you please help me how can I do that?
If you don’t know how to configure you local SMTP on Mac OS to receive mail from your Discourse instance, then you don’t want to try it. Even if you were to get it configured, it wouldn’t really be useful. You’ll be much better off using Mailgun or one of the other recommended mail services.
Rather than one-click, you should follow these instructions: https://github.com/discourse/discourse/blob/master/docs/INSTALL-cloud.md
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