Email campaign frequency

Hi all, I work for a small nonprofit (less than 10 employees) and I am the only other development employee besides the executive director. I have a couple questions on best practices surrounding email campaigns and newsletters, and I’m hoping to get some input.

For context, we used to have a monthly newsletter. At the request of our ED, I am now sending out weekly newsletters. I advocated for newsletters every other week, but agreed to trying more frequent emails.

We are launching a fundraising campaign that is set to run for 30 days, and our ED wants me to send out an email to our subscribers 3x a week for ~4 weeks. I suggested 2x a week at most, but our ED is pushing for 3x.

Does anyone have any feedback on the frequency of emails we’re sending? We currently have less than 1k subscribers and a really small individual donor base, so I’m concerned about pushing them too much, especially since we really haven’t done a huge push like this before. Open rate is pretty good, around 50%.