[[Zoho mail free for 5 addresses.][https://www.zoho.com/mail/zohomail-pricing.html]]
Setting up the MX records has good tutorials so it all doesn't end up in spam.
also there are wildcards, so that 5th account [email protected] can receive admin@ service@ boss@ sales@ .. all those.
I enjoyed working w/ R and R studio to have the code and published pdf always under version control and found that the reproducible research community added readers and feedback and interest from outside my narrowly-defined subject area. I didn't enjoy that frequent package updates would break everything. What kind of coding eco-system does your work exist in?