I’ve changed the docker-compose-override to use my pihole (which runs unbound) like described in the documentation, but I see a lot of dns-request for ‘.’ domain and tcpdump on the docker server gives me a lot of lines like:

23:48:58.626159 IP (tos 0x0, ttl 64, id 29317, offset 0, flags [none], proto UDP (17), length 56)
    172.22.1.254.46752 > 198.41.0.4.53: [bad udp cksum 0x7477 -> 0x5c9b!] 58551% [1au] NS? . ar: . OPT UDPsize=4096 DO (28)
23:48:59.008696 IP (tos 0x0, ttl 64, id 29408, offset 0, flags [none], proto UDP (17), length 56)
    172.22.1.254.45738 > 198.41.0.4.53: [bad udp cksum 0x7477 -> 0x5bce!] 62394% [1au] NS? . ar: . OPT UDPsize=1472 DO (28)
23:48:59.388812 IP (tos 0x0, ttl 64, id 309, offset 0, flags [none], proto UDP (17), length 56)
    172.22.1.254.52260 > 192.58.128.30.53: [bad udp cksum 0xeea2 -> 0xf8b4!] 47342% [1au] NS? . ar: . OPT UDPsize=4096 DO (28)

What can I check to see what causes this?

I reverted the change in the override and added the forwarding rule in unbound.conf.
The dots are gone, but I do see a lot of DS/A/AAAA request with the following data (these, but not limited to)

2020-08-24 06:56:42 DS fastly.net mailcow-host OK (forwarded) N/A (0.0ms)
2020-08-24 06:56:42 DNSKEY abuse.ch mailcow-host OK (forwarded) N/A (0.0ms)
2020-08-24 06:56:42 DS abuse.ch mailcow-host OK (forwarded) N/A (0.0ms)
2020-08-24 06:56:42 A p2.shared.global.fastly.net mailcow-host OK (forwarded) IP (5.8ms)
2020-08-24 06:56:42 AAAA p2.shared.global.fastly.net mailcow-host OK (forwarded) NODATA (8.6ms)
2020-08-24 06:56:10 DS redis:6379 mailcow-host OK (forwarded) N/A (0.0ms)
2020-08-24 06:56:10 DS redis:6379 mailcow-host OK (forwarded) N/A (0.0ms)
2020-08-24 06:56:10 DS redis:6379 mailcow-host OK (forwarded) N/A (0.0ms)
2020-08-24 06:56:10 DS redis:6379 mailcow-host OK (forwarded) N/A (0.0ms)
2020-08-24 06:56:10 DS redis:6379 mailcow-host OK (forwarded) N/A (0.0ms)
2020-08-24 06:56:10 DS redis:6379 mailcow-host OK (forwarded) N/A (0.0ms)
2020-08-24 06:56:10 AAAA redis:6379 mailcow-host OK (cached) NODATA (0.1ms)
2020-08-24 06:56:10 A redis:6379 mailcow-host OK (cached) NODATA (0.1ms)
2020-08-24 06:54:28 DS clamd:3310 mailcow-host OK (forwarded) N/A (0.0ms)
2020-08-24 06:54:28 DS clamd:3310 mailcow-host OK (forwarded) N/A (0.0ms)
2020-08-24 06:54:28 DS clamd:3310 mailcow-host OK (forwarded) N/A (0.0ms)
2020-08-24 06:54:28 DS clamd:3310 mailcow-host OK (forwarded) N/A (0.0ms)
2020-08-24 06:54:28 DS clamd:3310 mailcow-host OK (forwarded) N/A (0.0ms)
2020-08-24 06:54:28 DS clamd:3310 mailcow-host OK (forwarded) N/A (0.0ms)
2020-08-24 06:54:28 AAAA clamd:3310 mailcow-host OK (cached) NODATA (0.0ms)
2020-08-24 06:54:28 A clamd:3310 mailcow-host OK (cached) NODATA (0.1ms)
2020-08-24 06:53:54 DS rspamd:11333 mailcow-host OK (forwarded) N/A (0.0ms)
2020-08-24 06:53:54 DS rspamd:11333 mailcow-host OK (forwarded) N/A (0.0ms)
2020-08-24 06:53:54 DS rspamd:11333 mailcow-host OK (forwarded) N/A (0.0ms)
2020-08-24 06:53:54 DS rspamd:11333 mailcow-host OK (forwarded) N/A (0.0ms)
2020-08-24 06:53:54 DS rspamd:11333 mailcow-host OK (forwarded) N/A (0.0ms)
2020-08-24 06:53:54 DS rspamd:11333 mailcow-host OK (forwarded) N/A (0.0ms)
2020-08-24 06:53:54 AAAA rspamd:11333 mailcow-host OK (cached) NODATA (0.1ms)
2020-08-24 06:53:54 A rspamd:11333 mailcow-host OK (cached) NODATA (0.1ms)
2020-08-24 06:53:23 DS redis:6379 mailcow-host OK (forwarded) N/A (0.0ms)
2020-08-24 06:53:23 DS redis:6379 mailcow-host OK (forwarded) N/A (0.0ms)
2020-08-24 06:53:23 DS redis:6379 mailcow-host OK (forwarded) N/A (0.0ms)
2020-08-24 06:53:23 DS redis:6379 mailcow-host OK (forwarded) N/A (0.0ms)
2020-08-24 06:53:23 DS redis:6379 mailcow-host OK (forwarded) N/A (0.0ms)
2020-08-24 06:53:23 DS redis:6379 mailcow-host OK (forwarded) N/A (0.0ms)
2020-08-24 06:53:23 AAAA redis:6379 mailcow-host OK (cached) NODATA (0.0ms)
2020-08-24 06:53:23 A redis:6379 mailcow-host OK (cached) NODATA (0.0ms)
2020-08-24 06:53:14 DS olefy:10055 mailcow-host OK (forwarded) N/A (0.0ms)
2020-08-24 06:53:12 DS olefy:10055 mailcow-host OK (forwarded) N/A (0.0ms)
2020-08-24 06:53:12 DS localhost:11445 mailcow-host OK (forwarded) N/A (0.0ms)
2020-08-24 06:53:04 DS olefy:10055 mailcow-host OK (forwarded) N/A (0.0ms)
2020-08-24 06:53:04 DS localhost:11445 mailcow-host OK (forwarded) N/A (0.0ms)
2020-08-24 06:53:02 DS olefy:10055 mailcow-host OK (forwarded) N/A (0.0ms)
2020-08-24 06:53:02 DS localhost:11445 mailcow-host OK (forwarded) N/A (0.0ms)
2020-08-24 06:52:54 DS olefy:10055 mailcow-host OK (forwarded) N/A (0.0ms)
2020-08-24 06:52:54 DS localhost:11445 mailcow-host OK (forwarded) N/A (0.0ms)
2020-08-24 06:52:53 AAAA fuzzy.mailcow.email:11445 mailcow-host OK (forwarded) NXDOMAIN (0.2ms)
2020-08-24 06:52:53 A fuzzy.mailcow.email:11445 mailcow-host OK (forwarded) NXDOMAIN (0.2ms)
2020-08-24 06:52:52 DS olefy:10055 mailcow-host OK (forwarded) N/A (0.0ms)
2020-08-24 06:52:52 DS localhost:11445

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