Zig

Office365 Send Email using SMTP with OAuth2 Authentication

See more Office365 Examples

Demonstrates how to send email from smtp.office365.com using OAuth2 authentication. Zig

const std = @import("std");
const chilkat = @import("chilkat");

pub fn main(init: std.process.Init) !void {
    const alloc = init.arena.allocator();

    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    // An Office365 OAuth2 access token must first be obtained prior
    // to running this code.

    // Getting the OAuth2 access token for the 1st time requires the O365 account owner's
    // interactive authorization via a web browser.  Afterwards, the access token
    // can be repeatedly refreshed automatically (with no user interaction).

    // See the following examples for getting and refreshing an OAuth2 access token

    // Get Office365 SMTP/IMAP/POP3 OAuth2 Access Token
    // Refresh Office365 SMTP/IMAP/POP3 OAuth2 Access Token

    // First get our previously obtained OAuth2 access token.
    const json_token = try chilkat.JsonObject.init();
    defer json_token.deinit();
    try json_token.loadFile("qa_data/tokens/office365.json");

    const mailman = try chilkat.MailMan.init();
    defer mailman.deinit();

    mailman.setSmtpHost("smtp.office365.com");
    mailman.setSmtpPort(587);
    mailman.setStartTLS(true);

    // Use your Office365 email address for the SmtpUsername.
    mailman.setSmtpUsername("OFFICE365_EMAIL_ADDRESS");
    mailman.setOAuth2AccessToken(try json_token.stringOf(alloc, "access_token"));

    // Create a new email object
    const email = try chilkat.Email.init();
    defer email.deinit();

    email.setSubject("This is a test");
    email.setBody("This is a test");
    email.setFrom("MY_NAME <OFFICE365_EMAIL_ADDRESS>");
    try email.addTo("John Doe", "somebody@example.com");

    // Call SendEmail to connect to the SMTP server and send.
    // The connection (i.e. session) to the SMTP server remains
    // open so that subsequent SendEmail calls may use the
    // same connection.
    mailman.sendEmail(email) catch {
        std.debug.print("{s}\n", .{try mailman.getLastErrorText(alloc)});
        return;
    };

    // If SendEmail failed because of "Failed to get initial SMTP Response", then it may be
    // a firewall or anti-virus blocking communications.
    // See https://cknotes.com/smtp-office365-com-failed-to-get-initial-smtp-response/

    mailman.closeSmtpConnection() catch {
        std.debug.print("Connection to SMTP server not closed cleanly.\n", .{});
    };

    std.debug.print("Mail Sent!\n", .{});
}