Though IntelliJ and Pycharm are both open source. But if you use the rest of the suite then yeah

Or donate it to the lemmy development team

My experience with hosting mail was very good. I host my mail using Mailu, which is just a docker compose file and premade scripts for the usual mail stack software (Postfix, Dovecot, Nginx etc.). I hosy it on my home network using a raspberry pi. I score 9.8 on mail tester and my mail rarely ever lands in spam.

In total I spent maybe 3 hours setting everything up including my domain and 2 hours debugging issues. I honestly recommend self hosting mail.