Add bind_keyfiles_dir config option

See merge request !1375

Add an option to disable automatic creation of CAA record on issuing LE

Closes #6372

See merge request !1624

Added support for leading dots in amavis wildcard user lookups

Closes #5533

See merge request !1613

Resolve "Notifications to reseller not working"

Closes #6347

See merge request ispconfig/ispconfig3!1610

Resolve "SPF modification error with user account"

Closes #5481

See merge request ispconfig/ispconfig3!1612

Safe delete for mailboxes

Closes #6113

See merge request ispconfig/ispconfig3!1454

Delete mail_domain after mail_user records

Closes #6331

See merge request ispconfig/ispconfig3!1598

nginx: Added ACME redirect to main domain based on alias domain fix

Closes #4618

See merge request ispconfig/ispconfig3!1604

Also cleanup databases when a client is deleted, fixes #6304

Closes #6304

See merge request ispconfig/ispconfig3!1596

Resolve "Lower the entropy test value in BIND plugin to 200"

Closes #6366

See merge request ispconfig/ispconfig3!1619

Show the client name on the delete confirmation page

Closes #6334

See merge request ispconfig/ispconfig3!1601

Warn about duplicate code in a comment

See merge request ispconfig/ispconfig3!1597

Backport MR !889, unify settings between distros and improves

See merge request ispconfig/ispconfig3!1609

Change deprecated JQuery .load() to .on("load") - #6322

Closes #6322

See merge request !1607

Resolve "API to get mail user details for all account that belong to a domain"

Closes #6333

See merge request ispconfig/ispconfig3!1600

Add API function mail_user_get_all_by_client, #6332

Closes #6332

See merge request ispconfig/ispconfig3!1599

Added user field to datalog list view

Closes #6370

See merge request ispconfig/ispconfig3!1621

Check for different pure-ftpd log file locations (fixes FTP stats for EPEL/RHEL)

Closes #6378

See merge request ispconfig/ispconfig3!1625

- Updated edit links in html template

Amavisd supports wildcards by performing decreasingly specific SQL
lookups:
    9 - lookup for user+foo@sub.example.com
    8 - lookup for user@sub.example.com
    7 - lookup for user+foo
    6 - lookup for user
    5 - lookup for @sub.example.com
    3 - lookup for @.sub.example.com
    2 - lookup for @.example.com
    1 - lookup for @.com
    0 - lookup for @.       (catchall)
    (https://www.ijs.si/software/amavisd/README.lookups.txt)

However idn_to_* returns an empty string if the domain has a leading dot
which means lookups 0-3 cannot be used.  This is fixed by removing the
leading dot before encoding or decoding and adding it back just before
returning the domain.

Resolve "Two-factor authentication"

Closes #2558

See merge request ispconfig/ispconfig3!1575

Resolve "Send email to reseller when quota is reached"

Closes #6346

See merge request ispconfig/ispconfig3!1608