use-email-envelope 0.1.0

SMTP envelope identity and path primitives for RustUse
Documentation 
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# use-email-envelope

SMTP envelope identity and path primitives for `RustUse`.

## Experimental

`use-email-envelope` is experimental while `use-email` remains below `0.3.0`.

## Example

```rust
use use_email_envelope::{Envelope, EnvelopeRecipient, EnvelopeSender};

let envelope = Envelope::new(EnvelopeSender::new("bounce@example.com")?)
    .with_recipient(EnvelopeRecipient::new("jane@example.com")?);

assert_eq!(envelope.sender().to_string(), "<bounce@example.com>");
assert_eq!(envelope.recipients().len(), 1);
# Ok::<(), use_email_address::AddressValidationError>(())
```

## Scope

- Reverse-path, forward-path, MAIL FROM, RCPT TO, envelope sender, recipient, and envelope containers.
- SMTP envelope identity modeled separately from visible message headers.

## Non-goals

- SMTP client behavior.
- Bounce processing.
- Delivery tracking.

## License

Licensed under either Apache-2.0 or MIT.