To keep emails out of spam, it helps to use lots of variables, like {{Name}} or {{Occupation}}, but another great addition is to allow for RANDOM text and allowing emails to push out at RANDOM TIMES. These two feature is available on other platforms like Instantly and Grow Me Organic for example.
Here is an example of RANDOM text:
Hi {{firstName}} ,
You constantly tell others to prioritize {{RANDOM | self-care | me time | personal care}}, but when was the last time you did that for yourself?
Each our going email will randomly have one of those 3 options.
If you put 2 to 3 of these RANDOM text field in your emails, the spam bots would pick it up as 100 of "the same" emails going out.
Additionally, these platforms don't push out all your emails at the same time in 1 big batch. You can use "set intervals, like every 1-3 minutes, or better yet, randomly between 1 and 7 minutes apart.