SMTP relay questions

So, I have postfix as MTA. I will test these external relay providers:

mail.baby
mailcheap.co

My questions before I start:

  • Does the relay thing happens before rspamd rules or after? Will I have chance to limit user email quantity per certain amount of time?
  • Is there any hidden quirks while utilizing such third party relays? I mean forwarding, plus addressing etc. works as it would work with standard postfix?
  • Maybe anyone else knows better mail relays for web hosting providers?

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