Thanks for your replies.

@andreas:
Well, it was a bit hidden in my bug report but the real issue is that postfix 
doesn't delivers mail to dane-only domains:

to=<xxx@bueren.space>, relay=none, delay=2126, delays=2126/0.01/0/0,
dsn=4.7.5, status=deferred (non DNSSEC destination)

I created one test account you may use to send some local mail to:
ubuntu-bug@bueren.space

This is valid DANE domain and to reproduce the issue use the following
tls policies:

smtp_tls_policy_maps = hash:/etc/postfix/tls_policy

$ cat /etc/postfix/tls_policy
bueren.space dane-only


The smtp local client tries to verifiy the TLSA entries by using DNSSEC.
I simply use a local unbound DNS server.

This setting stopped working after the upgrade. Maybe the posttls-finger
is not so important, but this will trouble all mail admins who have some
dane-only entries in their policy (Oops, my DNS Server DNSSEC is bogus
-> Nope. Probably the other mail server isn't DANE safe anymore ->
Nope.).

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https://bugs.launchpad.net/bugs/1868955

Title:
  after upgrade to 20.04: posttls cannot connect to private/tlsmgr

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