Email send dont work

Having problems sending emails, after many attempts I managed to get Amazon Ses SMTP to work. Now if I try to send an email from my site (via the contact email) it arrives and therefore I think everything is working fine, also because in admin I no longer receive any system errors.
The problem is that users (and I too) don't receive emails notifying me if there is a new reply to a discussion I follow or have replied to.
What should I check?
Thank you

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