Wez Furlong bcd0e3746c lruttl: add predefined cache registry
This commit adds a declare_cache! macro that serves a couple of
purposes:

* Make it slightly less boilerplatey to define a cache
* Register them explicitly as a list of predefined caches, so that
  we can raise an error if lua code would conflict via memoize
* Enable a future change that allows reconfiguring the cache parameters
  for those predefined caches

Note: if you are using clang as a linker via RUSTFLAGS/.make-env,
the linkme crate that is employed for the registry may result
in linker errors. The solution that I have in my `.make-env` is
to add `-Clink-arg=-Wl,-z,nostart-stop-gc` to RUSTFLAGS so that
its sections are not removed too soon in the build process:

```
; cat .make-env
ROCKSDB_LIB_DIR=/usr/lib/x86_64-linux-gnu
RUSTFLAGS=-C linker=clang -C link-arg=-fuse-ld=lld --cfg tokio_unstable -Clink-arg=-Wl,-z,nostart-stop-gc
```
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KumoMTA

KumoMTA is an open-source Message Transfer Agent (MTA) designed for high-performance outbound email functionality, similar to commercial enterprise MTAs such as Momentum, PowerMTA, and Halon.

The KumoMTA project was founded by a group of email industry veterans with decades of experience building and managing high-performance On-Prem MTAs and is supported by a community of some of the largest senders in the world.

Because it is designed for high-performance sending environments, KumoMTA is for experienced email operations professionals who are accustomed to high-performance sending environments and familiar with DevOps practices.

Learn more in our FAQ and at https://kumomta.com/.

Documentation

You can learn more about KumoMTA from the Documentation.

Community

Real-time discussion is available on Our Discord.

Developers

If you are interested in contributing/extending KumoMTA, take a look at DEVELOPERS.md. The #devel channel on Our Discord is for contributors to discuss KumoMTA development.

Reporting Bugs

See How to Report Bugs.

Getting Help

See How to Get Help. For paid support see https://kumomta.com/support.

Getting Updates

You can subscribe to updates at https://kumomta.com/subscribe, we send updates periodically and will never sell nor share your information.

Talk to Us

We're available to talk about the project, book us at https://cal.com/team/kumomta/talk-with-kumomta.

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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Languages
Rust 91.8%
Lua 6.3%
Python 0.9%
Shell 0.8%
JavaScript 0.1%