Please be advised that where will hit your email (to the spam folder or inbox) depends first of all on the reputation of the domain in which the email came from.
Also emails that are sent frequently bother a lot. Emails sent seldomly allow the customers to forget you; and when you finally decide to remind people about yourself again, they may mark your message as spam, unless they are your staunch fans.
There are also other reasons why an email message can get into a spam folder. For example, it may happen if you didn't add an "Unsubscribe" or "View in Browser" link.
Before sending emails out, test them with an anti-spam tool.
It will give you a total score, will show if all the links work, etc.
We have an article that can help with checking your email for the main standard reasons and could help you to avoid SPAM filters.
Here is the link, please take a look - https://stripo.email/blog/avoid-spam-filters-sending-emails/
If you have any questions, please email us at firstname.lastname@example.org.