https://docs.unsent.dev

Unsent Rust SDK

Official Rust SDK for the Unsent API - Send transactional emails with ease.

Prerequisites

• Unsent API key
• Verified domain
• Rust 1.70 or higher

Installation

Add this to your Cargo.toml:

[dependencies]
unsent = "1.0"
serde_json = "1.0"

Usage

Basic Setup

use unsent::{Client, models::EmailCreate};

fn main() -> Result<(), Box<dyn std::error::Error>> {
    let client = Client::new("un_xxxx")?;
    
    // Use the client
    Ok(())
}

Environment Variables

You can also set your API key using environment variables:

// Set UNSENT_API_KEY in your environment
// Then initialize without passing the key
let client = Client::new("")?;

Sending Emails

Simple Email

use unsent::{Client, models::EmailCreate, emails::EmailsClient};

let client = Client::new("un_xxxx")?;
let emails = EmailsClient::new(&client);

let email = EmailCreate {
    to: serde_json::json!("hello@acme.com"),
    from: "hello@company.com".to_string(),
    subject: Some("Unsent email".to_string()),
    html: Some(Some("<p>Unsent is the best email service provider to send emails</p>".to_string())),
    text: Some(Some("Unsent is the best email service provider to send emails".to_string())),
    ..Default::default()
};

let response = emails.send(&email)?;
println!("Email sent! ID: {}", response.id);

Email with Attachments

use unsent::models::{EmailCreate, Attachment};

let email = EmailCreate {
    to: serde_json::json!("hello@acme.com"),
    from: "hello@company.com".to_string(),
    subject: Some("Email with attachment".to_string()),
    html: Some(Some("<p>Please find the attachment below</p>".to_string())),
    attachments: Some(vec![
        serde_json::json!({
            "filename": "document.pdf",
            "content": "base64-encoded-content-here"
        })
    ]),
    ..Default::default()
};

let response = emails.send(&email)?;

Scheduled Email

use chrono::{Utc, Duration};

let scheduled_time = (Utc::now() + Duration::hours(1)).to_rfc3339();

let email = EmailCreate {
    to: serde_json::json!("hello@acme.com"),
    from: "hello@company.com".to_string(),
    subject: Some("Scheduled email".to_string()),
    html: Some(Some("<p>This email was scheduled</p>".to_string())),
    scheduled_at: Some(scheduled_time),
    ..Default::default()
};

let response = emails.send(&email)?;

Batch Emails

use unsent::models::EmailBatchItem;

let batch = vec![
    EmailBatchItem {
        to: serde_json::json!("user1@example.com"),
        from: "hello@company.com".to_string(),
        subject: Some("Hello User 1".to_string()),
        html: Some(Some("<p>Welcome User 1</p>".to_string())),
        ..Default::default()
    },
    EmailBatchItem {
        to: serde_json::json!("user2@example.com"),
        from: "hello@company.com".to_string(),
        subject: Some("Hello User 2".to_string()),
        html: Some(Some("<p>Welcome User 2</p>".to_string())),
        ..Default::default()
    },
];

let response = emails.batch(&batch)?;
println!("Sent {} emails", response.ids.len());

Idempotent Retries

To prevent duplicate emails when retrying failed requests, you can provide an idempotency key.

use unsent::models::RequestOptions;

let options = RequestOptions {
    idempotency_key: Some("unique-key-123".to_string()),
};

let response = emails.send_with_options(&email, &options)?;

Managing Emails

Get Email Details

let email = emails.get("email_id")?;
println!("Email status: {}", email.data["status"]);

Update Email

use unsent::models::EmailUpdate;

let update = EmailUpdate {
    scheduled_at: None,
};

let response = emails.update("email_id", &update)?;

Cancel Scheduled Email

let response = emails.cancel("email_id")?;
println!("Email cancelled successfully");

List Emails

use unsent::models::EmailListParams;

let params = EmailListParams {
    limit: Some(20),
    page: Some(1),
    ..Default::default()
};

let emails = emails.list(Some(&params))?;

Email Statistics

// Get bounces
let bounces = emails.bounces(None)?;

// Get complaints
let complaints = emails.complaints(None)?;

// Get unsubscribes
let unsubscribes = emails.unsubscribes(None)?;

Managing Contact Books

List Contact Books

use unsent::contact_books::ContactBooksClient;

let client = Client::new("un_xxxx")?;
let books = ContactBooksClient::new(&client);

let book_list = books.list()?;

Create Contact Book

use unsent::models::ContactBookCreate;

let book = ContactBookCreate {
    name: "Newsletter Subscribers".to_string(),
    emoji: Some("📧".to_string()),
    properties: None,
};

let response = books.create(&book)?;

Get Contact Book

let book = books.get("book_id")?;

Update Contact Book

use unsent::models::ContactBookUpdate;

let update = ContactBookUpdate {
    name: Some("VIP List".to_string()),
    emoji: None,
    properties: None,
};

let response = books.update("book_id", &update)?;

Delete Contact Book

let response = books.delete("book_id")?;

Managing Contacts

List Contacts

// List contacts in a book
let contacts_list = contacts.list("book_id", None)?;

Create Contact

use unsent::{models::ContactCreate, contacts::ContactsClient};
use std::collections::HashMap;

let client = Client::new("un_xxxx")?;
let contacts = ContactsClient::new(&client);

let mut metadata = HashMap::new();
metadata.insert("company".to_string(), serde_json::json!("Acme Inc"));
metadata.insert("role".to_string(), serde_json::json!("Developer"));

let contact = ContactCreate {
    email: "user@example.com".to_string(),
    first_name: Some("John".to_string()),
    last_name: Some("Doe".to_string()),
    metadata: Some(metadata),
    
    // Optional fields
    phone_number: None,
    subscribed: None,
};

let response = contacts.create("contact_book_id", &contact)?;

Get Contact

let contact = contacts.get("contact_book_id", "contact_id")?;

Update Contact

use unsent::models::ContactUpdate;

let mut metadata = HashMap::new();
metadata.insert("role".to_string(), serde_json::json!("Senior Developer"));

let update = ContactUpdate {
    first_name: Some("Jane".to_string()),
    last_name: None,
    metadata: Some(metadata),
    
    // Optional
    email: None,
    phone_number: None,
    subscribed: None,
};

let response = contacts.update("contact_book_id", "contact_id", &update)?;

Upsert Contact

use unsent::models::ContactUpsert;

let upsert = ContactUpsert {
    email: Some("user@example.com".to_string()),
    first_name: Some("John".to_string()),
    last_name: Some("Doe".to_string()),
    metadata: None,
    
    // Optional fields
    phone_number: None,
    subscribed: None,
};

// Note: Pass upsert struct directly, serialization handles wrapper
let response = contacts.upsert("contact_book_id", "contact_id", &upsert)?;

Delete Contact

let response = contacts.delete("contact_book_id", "contact_id")?;

Managing Campaigns

List Campaigns

let active_campaigns = campaigns.list().await?;

Create Campaign

use unsent::{models::CampaignCreate, campaigns::CampaignsClient};

let client = Client::new("un_xxxx")?;
let campaigns = CampaignsClient::new(&client);

let campaign = CampaignCreate {
    name: "Welcome Series".to_string(),
    subject: "Welcome to our service!".to_string(),
    html: "<p>Thanks for joining us!</p>".to_string(),
    from: "welcome@example.com".to_string(),
    contact_book_id: "cb_1234567890".to_string(),
    
    // Optional fields
    reply_to: None,
    cc: None,
    bcc: None,
    attachments: None,
};

let response = campaigns.create(&campaign)?;
println!("Campaign created! ID: {}", response.campaign.id);

Schedule Campaign

use unsent::models::CampaignSchedule;

let schedule = CampaignSchedule {
    scheduled_at: "2024-12-01T10:00:00Z".to_string(),
};

let response = campaigns.schedule(&campaign.id, &schedule)?;

Pause/Resume Campaigns

// Pause a campaign
let pause_resp = campaigns.pause("campaign_123")?;
println!("Campaign paused successfully!");

// Resume a campaign
let resume_resp = campaigns.resume("campaign_123")?;
println!("Campaign resumed successfully!");

Get Campaign Details

let campaign_item = campaigns.get("campaign_id")?;
println!("Campaign status: {:?}", campaign_item.status);
println!("Recipients: {:?}", campaign_item.stats.total);
println!("Sent: {:?}", campaign_item.stats.sent);

Managing Domains

List Domains

use unsent::domains::DomainsClient;

let client = Client::new("un_xxxx")?;
let domains = DomainsClient::new(&client);

let domain_list = domains.list()?;
for domain in domain_list {
    println!("Domain: {}, Status: {:?}", domain.domain, domain.status);
}

Create Domain

use unsent::models::DomainCreate;

let domain = DomainCreate {
    domain: "example.com".to_string(),
};

let response = domains.create(&domain)?;

Verify Domain

let response = domains.verify("domain_id")?;
println!("Verification status: {}", response.success);

Get Domain

let domain = domains.get("domain_id")?;

Delete Domain

let response = domains.delete("domain_id")?;

Managing Webhooks (Coming Soon)

Note: Webhooks are currently in development and not fully implemented (server-side). The SDK includes these methods for future compatibility.

List Webhooks

use unsent::webhooks::WebhooksClient;

let client = Client::new("un_xxxx")?;
let webhooks = WebhooksClient::new(&client);

let refs = webhooks.list()?;

Create Webhook

use unsent::models::WebhookCreate;

let webhook = WebhookCreate {
    url: "https://example.com/webhook".to_string(),
    events: vec!["email.sent".to_string()],
};

let response = webhooks.create(&webhook)?;
println!("Webhook created! ID: {}", response.id);

Get Webhook

let webhook = webhooks.get("webhook_id").await?;

Update Webhook

use unsent::models::WebhookUpdate;

let update = WebhookUpdate {
    url: Some("https://example.com/new-webhook".to_string()),
    events: None,
};

let response = webhooks.update("webhook_id", &update).await?;

Test Webhook

let response = webhooks.test("webhook_id").await?;

Delete Webhook

let response = webhooks.delete("webhook_id")?;

Managing Templates

List Templates

use unsent::templates::TemplatesClient;

let client = Client::new("un_xxxx")?;
let templates = TemplatesClient::new(&client);

let template_list = templates.list().await?;

Create Template

use unsent::models::TemplateCreate;

let template = TemplateCreate {
    name: "Welcome Email".to_string(),
    subject: "Welcome!".to_string(),
    html: Some("<h1>Welcome</h1>".to_string()),
    content: Some("Welcome".to_string()),
};

let response = templates.create(&template).await?;

Get Template

let template = templates.get("template_id").await?;

Update Template

use unsent::models::TemplateUpdate;

let update = TemplateUpdate {
    name: Some("Updated Name".to_string()),
    subject: None,
    html: None,
    content: None,
};

let response = templates.update("template_id", &update).await?;

Delete Template

let response = templates.delete("template_id").await?;

Managing Suppressions

List Suppressions

use unsent::suppressions::SuppressionsClient;

let client = Client::new("un_xxxx")?;
let suppressions = SuppressionsClient::new(&client);

let suppression_list = suppressions.list(None).await?;

Add Suppression

use unsent::models::{AddSuppressionRequest, Reason};

let req = AddSuppressionRequest::new("spam@example.com".to_string(), Reason::Complaint);
let response = suppressions.add(&req).await?;

Delete Suppression

let response = suppressions.delete("spam@example.com").await?;

Activity & Analytics

Activity Feed

use unsent::activity::ActivityClient;

let client = Client::new("un_xxxx")?;
let activity = ActivityClient::new(&client);

let feed = activity.get(None).await?;

Analytics

use unsent::analytics::AnalyticsClient;

let client = Client::new("un_xxxx")?;
let analytics = AnalyticsClient::new(&client);

// General analytics
let stats = analytics.get().await?;

// Time series
let time_series = analytics.time_series(None).await?;

// Reputation
let reputation = analytics.reputation(None).await?;

Metrics & Stats

use unsent::{metrics::MetricsClient, stats::StatsClient};

let client = Client::new("un_xxxx")?;

// Metrics
let metrics = MetricsClient::new(&client);
let metrics_data = metrics.get(None).await?;

// Stats
let stats = StatsClient::new(&client);
let stats_data = stats.get(None).await?;

Events

use unsent::events::EventsClient;

let client = Client::new("un_xxxx")?;
let events = EventsClient::new(&client);

let event_list = events.list(None).await?;

System & Settings

API Keys

use unsent::api_keys::ApiKeysClient;
use unsent::models::ApiKeyCreate;

let client = Client::new("un_xxxx")?;
let api_keys = ApiKeysClient::new(&client);

// List
let keys = api_keys.list().await?;

// Create
let new_key = ApiKeyCreate::new("Prod Key".to_string());
let response = api_keys.create(&new_key).await?;

// Delete
let response = api_keys.delete("key_id").await?;

Settings & Team

use unsent::{settings::SettingsClient, teams::TeamsClient};

let client = Client::new("un_xxxx")?;

// Settings
let settings_client = SettingsClient::new(&client);
let settings = settings_client.get().await?;

// Teams
let teams_client = TeamsClient::new(&client);
let teams = teams_client.list().await?;
let my_team = teams_client.get().await?;

System Health

use unsent::system::SystemClient;

let client = Client::new("un_xxxx")?;
let system = SystemClient::new(&client);

let health = system.health().await?;
let version = system.version().await?;

Error Handling

The SDK uses Rust's Result type for error handling:

use unsent::{Client, UnsentError};

let client = Client::new("un_xxxx")?;

match emails.send(&email) {
    Ok(response) => println!("Email sent! ID: {}", response.id),
    Err(UnsentError::Api(api_error)) => {
        eprintln!("API Error: {} - {}", api_error.code, api_error.message);
    }
    Err(e) => eprintln!("Error: {}", e),
}

To disable automatic error raising:

let client = Client::new("un_xxxx")?.with_raise_on_error(false);

Custom HTTP Client

For advanced use cases, you can provide your own HTTP client:

use reqwest::blocking::Client as HttpClient;
use std::time::Duration;

let http_client = HttpClient::builder()
    .timeout(Duration::from_secs(30))
    .build()?;

let client = Client::new("un_xxxx")?.with_http_client(http_client);

API Reference

Client Methods

• Client::new(key) - Initialize the client
• .with_base_url(url) - Set custom base URL
• .with_http_client(client) - Set custom HTTP client
• .with_raise_on_error(raise) - Set error handling behavior

Email Methods

• emails.send(payload) - Send an email (alias for create)
• emails.create(payload) - Create and send an email
• emails.batch(emails) - Send multiple emails in batch
• emails.get(email_id) - Get email details
• emails.update(email_id, payload) - Update a scheduled email
• emails.cancel(email_id) - Cancel a scheduled email
• emails.list(params) - List emails with filters
• emails.bounces(params) - List bounced emails
• emails.complaints(params) - List spam complaints
• emails.unsubscribes(params) - List unsubscribes

Contact Methods

• contacts.list(book_id, params) - List contacts
• contacts.create(book_id, payload) - Create a contact
• contacts.get(book_id, contact_id) - Get contact details
• contacts.update(book_id, contact_id, payload) - Update a contact
• contacts.upsert(book_id, contact_id, payload) - Upsert a contact
• contacts.delete(book_id, contact_id) - Delete a contact

Contact Book Methods

• contact_books.list() - List contact books
• contact_books.create(payload) - Create contact book
• contact_books.get(id) - Get contact book
• contact_books.update(id, payload) - Update contact book
• contact_books.delete(id) - Delete contact book

Campaign Methods

• campaigns.list() - List all campaigns
• campaigns.create(payload) - Create a campaign
• campaigns.get(campaign_id) - Get campaign details
• campaigns.schedule(campaign_id, payload) - Schedule a campaign
• campaigns.pause(campaign_id) - Pause a campaign
• campaigns.resume(campaign_id) - Resume a campaign

Domain Methods

• domains.list() - List all domains
• domains.create(payload) - Create a domain
• domains.verify(domain_id) - Verify a domain
• domains.get(domain_id) - Get domain details
• domains.delete(domain_id) - Delete a domain

Webhook Methods

• webhooks.list() - List all webhooks
• webhooks.create(payload) - Create a webhook
• webhooks.update(id, payload) - Update a webhook
• webhooks.delete(id) - Delete a webhook

Template Methods

• templates.list() - List all templates
• templates.create(payload) - Create a template
• templates.get(id) - Get template details
• templates.update(id, payload) - Update a template
• templates.delete(id) - Delete a template

Activity Methods

• activity.get(params) - Get activity feed

Analytics Methods

• analytics.get() - Get email analytics
• analytics.time_series(params) - Get analytics time series
• analytics.reputation(params) - Get sender reputation

Metrics Methods

• metrics.get(params) - Get performance metrics

Stats Methods

• stats.get(params) - Get email statistics

Event Methods

• events.list(params) - List email events

API Key Methods

• api_keys.list() - List all API keys
• api_keys.create(payload) - Create an API key
• api_keys.delete(id) - Delete an API key

Settings Methods

• settings.get() - Get team settings

System Methods

• system.health() - Check API health
• system.version() - Get API version

Team Methods

• teams.list() - List all teams
• teams.get() - Get current team

Suppression Methods

• suppressions.list(params) - List suppressed emails
• suppressions.add(payload) - Add email to suppression list
• suppressions.delete(email) - Remove email from suppression list

Requirements

• Rust 1.70+

License

MIT

Support

• Documentation
• GitHub Issues
• Discord Community