Is cloudron build in email server considered as basic SMTP? Will it instantly marked as spam an blacklisted by all mail provider if i send newsletter for marketing funnel purpose to around 1000 email with frequency once or twice a a week. I want to avoid mailgun.
Yes, Cloudron is "basic SMTP" (per their definition). It's really hard to say whether your VPS provider will take offense with sending 1000 emails twice a week or not. You should probably just ask them. If they are one of the "big" VPS providers, be totally prepared for anything, including your account being banned. This is just how they work since even if they say it's totally fine some internal alert. kicks in, not being all fatalistic :-).
Anyway, I would recommend using external relay for large lists (1000 is big enough).
So it seems that (for now at least) a campaign must have the FROM address as the app mail address. At least the same actual address, but the "friendly name" can be changed. Which is good.
Good points. So, if you let Cloudron manage the email address, then you have to change it from Cloudron Dashboard -> App -> Email -> From address setting. This will fixup the config accordingly. You can also change the setting there to have Cloudron not manage the email at all (if you want to relay using some other provider from inside listmonk).
The name is not configurable but it should be, will fix the package (or the box code).