Hello @L96481 ,
The first and foremost issue you'd need to address is getting your account setup for self-authentication. With you sending to school domains, they'll likely have pretty tight gatekeeping for any external emails being sent to their servers, especially if the email is coming from a service provider source like ours. Having your account self-authenticated will make your emails being sent through us (or any ESP for that mater) a lot more trustworthy.
With the high bounce and low open rates for the 2nd and 3rd emails, the lack of self-authentication was likely the source of its lack of engagement and exposure. Even if the emails managed to survive being bounced back from the receiving servers, they might've still gotten spammed out or quarantined due to that lack of authentication. Even your first email's only clicker was one person who clicked every link in the email within the same minute it was opened - indicating they're using a security program that auto-clicks links to check for malware.
I'd recommend taking a look at some of the pointers in this advice article. If you'd like live help implementing these, or would like some 1:1 guidance, our general phone support is also available. If you're wanting greater insight on your particular content, then I'd advise looking into either our Marketing Advisor or Specialist premium services.
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