Wez Furlong 343411c3d2 Add event for rewriting a failed smtp response
This will only trigger for messages where we've gotten to MAIL FROM or
later, and where we got a non-250 response.

The event is passed the response + the domain, tenant, campaign and
routing domain.  It can return an alternative response code value
or `null` to indicate no change.
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KumoMTA

This repository holds the source code to KumoMTA, a modern Message Transfer Agent designed for large scale sending environments.

You can learn more about why it exists here.

Documentation

You can learn more about KumoMTA from the Documentation

Community

Real-time discussion is available on Our Discord.

Our Forum is better for long-form questions and discussions.

Developers

If you're interesting in contributing/extending KumoMTA, take a look at DEVELOPERS.md.

Getting Help

Please see How to Report Bugs or Get Help

S
Description
The first Open-Source high-performance MTA developed from the ground-up for high-volume email sending environments.
Readme
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