(C# UWP/WinRT) Convert HTML Web Page to Email and Send

Converts an HTML page at a URL into an email with embedded images and sends it.

Chilkat Universal Windows Platform (UWP) / WinRT Downloads Chilkat for the Universal Windows Platform (UWP)

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

Chilkat.MailMan mailman = new Chilkat.MailMan();

// The MHT component can be used to convert an HTML page
// from a URL, file, or in-memory HTML into an email
// with embedded images and style sheets.
Chilkat.Mht mht = new Chilkat.Mht();

Chilkat.Email email = new Chilkat.Email();

// There are two ways of embedding images in emails: with CIDs
// and without.  When using CIDs, the IMG SRC attributes use
// urls that begin with "cid:" and the corresponding image
// embedded within the email includes a Content-ID header field.
// When not using CIDs, the IMG SRC attribute can have a URL,
// path, etc. and the corresponding image embedded within
// the email has a matching Content-Location header field.

// When testing with GMail, if CIDs are used the email will
// be displayed with images blocked (by default) unless
// the user allows them to be displayed.  Without CIDs,
// the images are automatically displayed.

// When testing with Eudora, Mozilla Thunderbird, and Outlook Express, 
// embedded images display correctly with our without CIDs.

// When testing with Yahoo! Mail, embedded images display OK.
// However, the Yahoo! Mail user has the option of blocking
// images.  If this is turned on, the CID images will still 
// display correctly even though images are blocked.  Why?
// It's because when viewing the email there is no external
// HTTP request to fetch an image.  Therefore, a spammer 
// cannot get an indication that you've read the email. 
// However, if CIDs are not used, the images are blocked by 
// any Yahoo! Mail user that has image blocking turned on --
// even though the images are embedded.

// I haven't tested Hotmail yet...
// Regardless, there is no perfect solution.  If CIDs are used,
// GMail users may block your embedded images, if CIDs are not
// used, Yahoo! Mail users may block your embedded images.

// I recommend setting using CIDs.  This is what Mozilla Thunderbird
// does by default, and it's the more clear an unambiguous way
// to indicate that images are indeed embedded.
mht.UseCids = true;

string emlStr = await mht.GetEMLAsync("http://www.bonairefishing.com/");
if (mht.LastMethodSuccess != true) {
    Debug.WriteLine(mht.LastErrorText);
    return;
}

bool success = email.SetFromMimeText(emlStr);
if (success != true) {
    Debug.WriteLine(email.LastErrorText);
    return;
}

email.Subject = "Test HTML email";

// This example is tested in:
// Outlook 2000, Eudora 7, Mozilla Thunderbird 1.5.0.9, Outlook Express 6, GMail, Yahoo Mail
success = email.AddTo("Chilkat Support","support@chilkatsoft.com");

// Note: Chilkat does not regularly check our GMail and Yahoo
// email accounts.  Please send support email to support@chilkatsoft.com
success = email.AddTo("Chilkat on Yahoo","chilkat_software@yahoo.com");
success = email.AddTo("Chilkat on GMail","chilkat.support@gmail.com");

email.From = "chilkat@live.com";

// Send email using smtp.live.com
mailman.SmtpHost = "smtp.live.com";
mailman.SmtpUsername = "chilkat@live.com";
mailman.SmtpPassword = "myPassword";
mailman.SmtpPort = 587;
mailman.StartTLS = true;

success = await mailman.SendEmailAsync(email);
if (success != true) {
    Debug.WriteLine(mailman.LastErrorText);
    return;
}

success = await mailman.CloseSmtpConnectionAsync();
if (success != true) {
    Debug.WriteLine(mailman.LastErrorText);
    return;
}

Debug.WriteLine("HTML Email Sent!");