email-transport-resend

Resend transport implementation for email-transport.

Scope contract

• Sends structured email_message::Message values through Resend's JSON API.
• Supports text/html bodies, custom headers, attachments, inline attachments, and idempotency keys.
• Exposes Resend-specific per-send options through ResendSendOptions.

Send options

• ResendSendOptions
• ResendTag
• ResendTemplate

Insert ResendSendOptions into SendOptions.transport_options to set Resend-only tags or template data for one send attempt. The same struct is serde-compatible for queued transport_options.resend payloads.

use email_transport::TransportOptions;
use email_transport_resend::{ResendSendOptions, ResendTemplate};

let mut transport_options = TransportOptions::default();
transport_options.insert(
    ResendSendOptions::new()
        .with_tags([("env", "prod"), ("tenant", "blue")])
        .with_template(
            ResendTemplate::new("tmpl_welcome")
                .with_variables([("name", serde_json::json!("Ada"))]),
        ),
);

Example

Run the example with:

RESEND_API_KEY=... RESEND_TO=you@example.com cargo run -p email-transport-resend --example resend_send

Development

• Run tests: cargo test -p email-transport-resend
• Check wasm compatibility: cargo check -p email-transport-resend --target wasm32-unknown-unknown