I'd like to see some modern security updates like encFS or some other encrypted mail storage as well as DANE, DMARC, DNSSEC, etc.
From "mail-in-a-box" project website:
"It implements modern mail protocols (SPF, DKIM, and DMARC) and the latest security best practices, including opportunistic TLS, strong ciphers, and HSTS. When enabled, DNSSEC (with DANE TLSA) provides a higher level of protection against active attacks. Exchange ActiveSync is also available as a beta feature."
I know iRedmail already implements SPF, DKIM. How about HSTS? and DNSSEC (with DANE TLSA)?
How about Z-push?