# Mailgun api key, what is it for?

**URL:** https://meta.discourse.org/t/mailgun-api-key-what-is-it-for/103962
**Category:** Support
**Created:** [11.Декабрь.2018 01:40:06 UTC](https://meta.discourse.org/t/mailgun-api-key-what-is-it-for/103962 "2018-12-11T01:40:06Z")
**Posts on this page:** 1
**Showing post:** 3

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### Author: ![zogstrip](https://sea3.discourse-cdn.com/meta/user_avatar/meta.discourse.org/zogstrip/32/512781_2.png) [@zogstrip](https://meta.discourse.org/u/zogstrip)
#### Post date: [11.Декабрь.2018 18:35:37 UTC](https://meta.discourse.org/t/mailgun-api-key-what-is-it-for/103962/3 "2018-12-11T18:35:37Z")

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More information available on the dedicated howto topic 😉

> [@Configure VERP to handle bouncing e-mails](https://meta.discourse.org/t/handling-bouncing-e-mails/45343):
>
> Setting up bounces handling Discourse uses the [Variable envelope return path (VERP)](https://en.wikipedia.org/wiki/Variable_envelope_return_path) technique to handle bouncing e-mails. To enable VERP, set the “reply by email address” site setting with an email address template that uses the + sign. The default of replies+%{reply\_key}@discourse.example.com … works fine. If you are using your own or your company’s email server, then, that’s it tada Your discourse instance must be able to receive email sent to this address. This should work via POP, bu…

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