Hi volopolo,
Thanks for the review! I’m sorry to hear you ran into email delivery issues. These issues aren’t actually tied to our plugin specifically, but rather a result of 2 things: server configuration and/or filtering by the recipient’s email provider. We’ve shared more details about this over in our email delivery/SMTP article.
It sounds like you’ve already installed an SMTP plugin, which is great and our recommended fix. We even acquired the super popular WP Mail SMTP last year, overhauled it with tons of improvements, and continue to grow and improve it (even while keeping it a free plugin) since we know this is such critical functionality for websites as well as an increasingly common issue.
I hope these details are helpful! Or if there’s any other way that we can assist, please share those details over in our Lite support forum. There, we provide limited, complimentary support to all of our Lite users.
Thanks!