docker run -it --dns 192.168.137.2 mono

root@ac08c4d34e80:/# ping queue
PING queue.dev.mldev.local (192.168.137.3): 48 data bytes
56 bytes from 192.168.137.3: icmp_seq=0 ttl=64 time=0.058 ms
56 bytes from 192.168.137.3: icmp_seq=1 ttl=64 time=0.096 ms
56 bytes from 192.168.137.3: icmp_seq=2 ttl=64 time=0.082 ms
56 bytes from 192.168.137.3: icmp_seq=3 ttl=64 time=0.092 ms
^C--- queue.dev.mldev.local ping statistics ---
4 packets transmitted, 4 packets received, 0% packet loss
round-trip min/avg/max/stddev = 0.058/0.082/0.096/0.000 ms

FROM mono
COPY . /app
WORKDIR /app
CMD /usr/bin/mono `ls *.exe | head -1`

docker build -t email-sender .

docker run -d --dns 192.168.137.2 email-sender

docker exec -i -t 5f /bin/bash

root@5f4f73d31a23:/app# ping queue
ping: unknown host
root@5f4f73d31a23:/app#