Why html email sent as plain text in ASP.NET MVC? [duplicate]

Question

This is my code :

MailMessage mail = new MailMessage();
mail.From = new MailAddress(emailFrom);
mail.To.Add(new MailAddress(emailTo));
mail.IsBodyHtml = true;
mail.Subject = subject;
mail.Body = body.ToString();

System.Net.ServicePointManager.ServerCertificateValidationCallback = new System.Net.Security.RemoteCertificateValidationCallback(RemoteServerCertificateValidationCallback);
AlternateView htmlView = AlternateView.CreateAlternateViewFromString(body, Encoding.UTF8, "text/html");
mail.AlternateViews.Add(htmlView);
SmtpClient smtp = new SmtpClient();
smtp.Host = "mail.alpc.ir";
smtp.Port = 25;
smtp.UseDefaultCredentials = false;
smtp.Credentials = new NetworkCredential(emailFrom, emailFromPassword);
smtp.EnableSsl = true;
smtp.DeliveryMethod = SmtpDeliveryMethod.Network;
smtp.Send(mail);

Email is sent successfully, but it's sent as plain text.

Received email :

p{margin-top: 0;margin-bottom: 0.5rem;}:root{--w1:600px;}:root{--d2:0.5rem;}:root{--fs:12px}@font-face {font-family: iransans;font-style: normal;font-weight: normal;src: url('https://sadidgostaran.ir/Content/IRANSansWeb.woff2') format('woff2');}@media only screen and (max-width:630px){:root{--w1:100%;}}@media only screen and (max-width:420px){:root{--fs:10px}.table-responsive{display: block;width: 100%;overflow-x: auto;-webkit-overflow-scrolling: touch;}}
گیرنده گرامی
werqwefsdvfasdf asfweqfwqr werwqreqwf werwqrqwefswadf qwerewrwerqwefsdvfasdf asfweqfwqr werwqreqwf werwqrqwefswadf qwerewrwerqwefsdvfasdf asfweqfwqr werwqreqwf werwqrqwefswadf qwerewrwerqwefsdvfasdf asfweqfwqr werwqreqwf werwqrqwefswadf qwerewrwerqwefsdvfasdf asfweqfwqr werwqreqwf werwqrqwefswadf qwerewrwerqwefsdvfasdf asfweqfwqr werwqreqwf werwqrqwefswadf qwerewrwerqwefsdvfasdf asfweqfwqr werwqreqwf werwqrqwefswadf qwerewr
ما را در شبکه های اجتماعی دنبال کنید
سدید گستران در گوگلمحمد مهدی نعمتیسمت شخصسدید گستران امین 021-54942 - 09123456789
[email protected]
www.sadidgostaran.ir
میدان ولیعصر - ساختمان تجاری ایرانیان - طبقه 4 - واحد 5

Well - the most obvious question is: what's the value of ishtml that you assign to the mail.IsBodyHtml property? — marc_s
– marc_s, Commented May 27, 2023 at 5:47
whats the value of ishtml on mail.IsBodyHtml = ishtml is it have the correct value? that being said, even if you tell the client its html some may ignore it and show it as plain text for security. also, make sure to use inlined css and avoid custom fonts for maximum compatibility. — Bagus Tesa
– Bagus Tesa, Commented May 27, 2023 at 5:47
oh, don't forget to provide the plain text version using AlternateView to avoid giving user gibberish html in case their client is refusing html. most of your problem will be on the client instead of the c# smtp API, fyi. — Bagus Tesa
– Bagus Tesa, Commented May 27, 2023 at 5:51
Add that to your code and try it, and when it doesn't work, update your original question with the change to the code and he fact that even with it set to true it does not work. As written, it's not possible to see whether it's true or not. And honestly, other programmers aren't going to trust you ;) — Steve
– Steve, Commented May 27, 2023 at 6:11

jmcilhinney · Accepted Answer · 2023-05-27 07:10:33Z

1

You are creating a MailMessage object and then you don't use it. In the code you posted, the sixth line is the last mention of that MailMessage object. The line where you actually send the email is here:

smtp.Send(emailFrom, emailTo, subject, body);

How is the IsBodyHtml property of that MailMessage supposed to affect that? You need to use the other overload of Send; the one that takes a MailMessage object as an argument:

smtp.Send(mail);

answered May 27, 2023 at 7:10

jmcilhinney

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2 Comments

meysam rahpeyma Over a year ago

i try this way but html email sent as plain text

jmcilhinney Over a year ago

@meysamrahpeyma, update your question with your new code and make sure that it includes an actual message body that you've tested and claim doesn't work. We need to be able to see exactly what you are.

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