Hello @Cres.Cor ,
Here are some general best practices for delivery.
Deliverability 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.
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Regarding the subject line personalization, please note that subject line personalization doesn't display when previewing an email or when sending a test email. To see what the personalization looks like, you could try copying your email and sending yourself the copy as a live send (i.e. your email as a contact in a list on its own).
I'd recommend checking out our main article on subject line personalization for more details, and for common workarounds / quirks to look out for.
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William A
Community & Social Media Support
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