Hello @FernandoG799 ,
Here are some general best practices for delivery.
Delivery can have a lot of variables, from elements on our side, on your side, on the recipient's side, and in their email system company's side. It's also a generally good idea to set up additional authentication for your emails - whether that's through us if you have a free domain (e.g. Gmail, Yahoo, AOL, etc.) or via self-authentication if you have your own domain (such as through a business or other organization).
If you'd like to learn more about safelisting, and what it entails:
Safelisting domains in a security system
Safelisting email addresses in an email client or security system
If you're wanting more in-depth, specialized insight on your current deliverability, it'd be worth speaking with one of our Delivery agents.
Community & Social Media Support
Did I answer your question? If so, please mark my post as an "Accepted Solution"
by clicking the Accept as Solution button in the bottom right hand corner of this post. Anyone can be a marketer! Visit our Blog & Resources page to brush up on the latest tips and tricks.