Servers on the same ip, how to implement?

Question

linux

All evening.
There are 2 servers, mail on port 443 and 3 domains for sites on port 80 work on the first one. One of the sites also needs to move to port 443. And I can't figure out how to implement it. You can use additional free external addresses, but too much fence is also harmful.
Sites and mail on debian and apache
Thank you all

Answer 1

nginx proxy

Answer 2

Implement approximately the same as on port 80 :)
https://wiki.apache.org/httpd/NameBasedSSLVHostsWithSNI