Hello @Cahen1 ,
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, such as self-authentication if you have your own domain.
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
It's also a good idea to keep in mind that test emails don't send out with any authentication, do if your test emails are going to spam - that ay be the largest contributor. Without authentication, it looks like you're sending an email to yourself, when it's actually coming from another source, which tends to trigger most email programs' security algorithms.
If you're wanting more in-depth, specialized insight on your current deliverability, it'd be worth speaking with one of our Delivery agents.
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