Wez Furlong 3ed4bb8083 Improve context in jinja template error messages
For this invalid jinja field: `{{ First Name }}` we'd report:

```
syntax error: unexpected identifier, expected end of variable block (in 0:1)
```

which is not very helpful.

With this commit we now report:

```
failed parsing field 'content.text_body' as template: syntax error: unexpected identifier, expected end of variable block (in template '0' line 1: 'Hello {{ First Name }},')
```

which is much more informative!

We include a length-limited fragment of the extracted source line in the
message to help track down the issue.  It is length limited because the
templates can potentially be very large.

The string truncation requires a function that was stabilized in rust
1.91, so this commit bumps the minimum version required.
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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. Issues are for features and bugs only, any help requests posted to Issues will be closed. 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.
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