Swift-SMTP

Swift SMTP client.

Features

Connect securely through SSL/TLS when needed
Authenticate with CRAM-MD5, LOGIN, PLAIN, or XOAUTH2
Send emails with local file, HTML, and raw data attachments
Add custom headers
Documentation

Swift Version

macOS & Linux: Swift 4.0.3

Migration Guide

Version 4.0.0 & 3.0.0 bring breaking changes. See the quick migration guide here.

Usage

Initialize an SMTP instance:

import SwiftSMTP

let smtp = SMTP(
    hostname: "smtp.gmail.com",     // SMTP server address
    email: "user@gmail.com",        // username to login
    password: "password"            // password to login
)

TLS

Additional parameters of SMTP struct:

public init(hostname: String,
            email: String,
            password: String,
            port: Int32 = 465,
            useTLS: Bool = true,
            tlsConfiguration: TLSConfiguration? = nil,
            authMethods: [AuthMethod] = [],
            domainName: String = "localhost",
            timeout: UInt = 10)

By default, the SMTP struct connects on port 465 and tries to connect using TLS. It also uses a TLSConfiguration that uses no backing certificates. Configure these to your needs. For more info on TLSConfiguration, view the docs.

Send email

Create a Mail object and use your SMTP handle to send it. To set the sender and receiver of an email, use the User struct:

let drLight = User(name: "Dr. Light", email: "drlight@gmail.com")
let megaman = User(name: "Megaman", email: "megaman@gmail.com")

let mail = Mail(
    from: drLight,
    to: [megaman],
    subject: "Humans and robots living together in harmony and equality.",
    text: "That was my ultimate wish."
)

smtp.send(mail) { (error) in
    if let error = error {
        print(error)
    }
}

Add Cc and Bcc:

let roll = User(name: "Roll", email: "roll@gmail.com")
let zero = User(name: "Zero", email: "zero@gmail.com")

let mail = Mail(
    from: drLight,
    to: [megaman],
    cc: [roll],
    bcc: [zero],
    subject: "Robots should be used for the betterment of mankind.",
    text: "Any other use would be...unethical."
)

smtp.send(mail)

Send attachments

Create an Attachment, attach it to your Mail, and send it through the SMTP handle. Here's an example of how you can send the three supported types of attachments--a local file, HTML, and raw data:

// Create a file `Attachment`
let fileAttachment = Attachment(
    filePath: "~/img.png",          
    // "CONTENT-ID" lets you reference this in another attachment
    additionalHeaders: ["CONTENT-ID": "img001"]
)

// Create an HTML `Attachment`
let htmlAttachment = Attachment(
    htmlContent: "<html>Here's an image: <img src=\"cid:img001\"/></html>",
    // To reference `fileAttachment`
    related: [fileAttachment]
)

// Create a data `Attachment`
let data = "{\"key\": \"hello world\"}".data(using: .utf8)!
let dataAttachment = Attachment(
    data: data,
    mime: "application/json",
    name: "file.json",
    // send as a standalone attachment
    inline: false   
)

// Create a `Mail` and include the `Attachment`s
let mail = Mail(
    from: from,
    to: [to],
    subject: "Check out this image and JSON file!",
    // The attachments we created earlier
    attachments: [htmlAttachment, dataAttachment]
)

// Send the mail
smtp.send(mail)

/* Each type of attachment has additional parameters for further customization */

Send multiple mails

let mail1: Mail = //...
let mail2: Mail = //...

smtp.send([mail1, mail2],
    // This optional callback gets called after each `Mail` is sent.
    // `mail` is the attempted `Mail`, `error` is the error if one occured.
    progress: { (mail, error) in
    },

    // This optional callback gets called after all the mails have been sent.
    // `sent` is an array of the successfully sent `Mail`s.
    // `failed` is an array of (Mail, Error)--the failed `Mail`s and their corresponding errors.
    completion: { (sent, failed) in
    }
)

Acknowledgements

Inspired by Hedwig and Perfect-SMTP.

License

Apache v2.0

hanskroner/Swift-SMTP