Problem with notifications via mail

[Jorysm]

I have configured notifications via email, but I get the following error

ERR Mail notification failed error="dial tcp: lookup ***** on 127.0.0.11:53: no such host"

If it helps

`docker run --rm -it busybox nslookup registry-1.docker.io
Unable to find image 'busybox:latest' locally
latest: Pulling from library/busybox
1523c6c3dc4c: Pull complete
Status: Downloaded newer image for busybox:latest
Server: 192.168.1.1
Address: 192.168.1.1:53

Non-authoritative answer:
Name: registry-1.docker.io
Address: 54.236.113.205
Name: registry-1.docker.io
Address: 54.198.86.24
Name: registry-1.docker.io
Address: 54.227.20.253

Non-authoritative answer:
Name: registry-1.docker.io
Address: 2600:1f18:2148:bc02:445d:9ace:d20b:c303
Name: registry-1.docker.io
Address: 2600:1f18:2148:bc01:571f:e759:a87a:2961
Name: registry-1.docker.io
Address: 2600:1f18:2148:bc00:8d61:9b62:40aa:8bb8`