If I may ask something offtopic: I try to host my own email in Iceland. I go everything working so far. My server is not powerful enough for spamassassin but I

If I may ask something offtopic: I try to host my own email in Iceland. I go everything working so far. My server is not powerful enough for spamassassin but I can live without it. One last problem: I don't get SSL to work. Does https require lots of server resources?