Which parts of computer science are you interested in? I would suggest looking at some different universities’ current fields of research to find one with a focus that aligns with your academic profile.
You can use this as a starting point in your search, as it has sorting options based on topic https://edurank.org/cs/eu/
Zoho works well for me with my own domain (though I am on the old free plan that allows IMAP, while today the free plan only supports webmail or their own app). I also know someone who uses Tuta without problems sending to Google and Microsoft.