~guidocella/personal-email-server-guide

use more rsync flags
use Unlicense
use filter-dkimsign since it no longer crashes
stop documenting DKIMproxy because it's obsolete
add more angle brackets
add note for Debian 12
explain how to set cert permissions
don't specify the network interface
wrap variables in angle brackets
don't specify the network interface
there is no need to check where filters go
remove minimum version

OpenSMTPD 6.4 is old enough that there's no need mention it.
opensmtpd-filter-dkimsign is in Debian 12
rename filters
update to Debian 11
switch to rspamd
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