# Custom docker network configuration - container to container comms

**URL:** <https://meta.discourse.org/t/custom-docker-network-configuration-container-to-container-comms/84654>\
**Category:** Self-hosting\
**Created:** [April 5, 2018, 3:52pm UTC](https://meta.discourse.org/t/custom-docker-network-configuration-container-to-container-comms/84654 "2018-04-05T15:52:23Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![mpalmer](https://sea3.discourse-cdn.com/meta/user_avatar/meta.discourse.org/mpalmer/32/45740_2.png) [@mpalmer](https://meta.discourse.org/u/mpalmer)\
**Post date:** [April 5, 2018, 11:50pm UTC](https://meta.discourse.org/t/custom-docker-network-configuration-container-to-container-comms/84654/2 "2018-04-05T23:50:44Z")

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We don’t use Docker compose (in any of the many forms it has taken over the years), so we’re not going to be able to translate an isolated snippet of its config into anything useful. What are you actually trying to achieve, in general terms? rDNS isn’t usually Docker’s concern, and it’s weird that you’ve got your SMTP server configured to do rDNS lookups on local submission anyway.

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