Zig

Send a Raw SMTP Command

Demonstrates the Chilkat MailMan.SmtpSendRawCommand method, which sends a raw command to the SMTP server and returns the server's response. The second argument specifies the charset to use if the command contains non-US-ASCII characters, and the third indicates whether to base64-encode the command before sending. This example sends a raw NOOP on an open connection.

Background: SMTP is a line-based text protocol (EHLO, MAIL FROM, RCPT TO, DATA, QUIT), so a raw-command hook lets you issue anything Chilkat doesn't wrap — a server extension, or a custom step during a manual auth exchange. The base64 flag exists because some SMTP exchanges (notably AUTH challenge/response) require the argument to be base64-encoded on the wire.

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Zig

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

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

    // Demonstrates the MailMan.SmtpSendRawCommand method, which sends a raw command to the SMTP
    // server and returns the server's response.  The 2nd argument is the charset used if the
    // command contains non-US-ASCII characters, and the 3rd indicates whether to base64-encode
    // the command before sending.

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

    // Configure the SMTP server connection.
    mailman.setSmtpHost("smtp.example.com");
    mailman.setSmtpPort(465);
    mailman.setSmtpSsl(true);
    mailman.setSmtpUsername("user@example.com");
    mailman.setSmtpPassword("myPassword");

    mailman.openSmtpConnection() catch {
        std.debug.print("{s}\n", .{try mailman.getLastErrorText(alloc)});
        return;
    };

    // Send the raw SMTP NOOP command (not base64-encoded).
    const response = mailman.smtpSendRawCommand(alloc, "NOOP", "us-ascii", false) catch {
        std.debug.print("{s}\n", .{try mailman.getLastErrorText(alloc)});
        return;
    };

    std.debug.print("NOOP response: {s}\n", .{response});

    mailman.closeSmtpConnection() catch {
        std.debug.print("{s}\n", .{try mailman.getLastErrorText(alloc)});
        return;
    };
}