How send email with embedded image in base64 for Gmail?

Question

How send email with embedded image in base64 for Gmail?

Jair Onofre 1

if i send image in base64, i received this in email:

I try to send a base64 image how embedded image, but gmail doesn't accept it, does anyone know if there is another way I can do this? (Outlook Accept)

Viorel 122.5K Reputation points

2021-11-01T20:22:14.227+00:00

Which code or technique are you using for sending the E-mails? Make sure that you are building an "HTML" message, not a simple text.
Jair Onofre 1 Reputation point

2021-11-01T20:28:56.35+00:00

he convert all in the body email for html.

For send the email, i used sendgrid package:
Castorix31 90,521 Reputation points

2021-11-01T21:48:03.213+00:00

You don't need to encode it in Base64 for Gmail, you can just embed it in HTML with System.Net.Mail.LinkedResource for example
Jack J Jun 25,296 Reputation points

2021-11-19T09:28:36.997+00:00

@Jair Onofre , is any update? Please check if my answer works for you.

1 answer

Your answer

Viorel 122.5K Reputation points

2021-11-01T20:22:14.227+00:00

Which code or technique are you using for sending the E-mails? Make sure that you are building an "HTML" message, not a simple text.
Jair Onofre 1 Reputation point

2021-11-01T20:28:56.35+00:00

he convert all in the body email for html.

For send the email, i used sendgrid package:
Castorix31 90,521 Reputation points

2021-11-01T21:48:03.213+00:00

You don't need to encode it in Base64 for Gmail, you can just embed it in HTML with System.Net.Mail.LinkedResource for example
Jack J Jun 25,296 Reputation points

2021-11-19T09:28:36.997+00:00

@Jair Onofre , is any update? Please check if my answer works for you.

Answer 1

@Jair Onofre , as others said, there is no need to encode it in Base64 If you want to send email with embedded image by using c#.

Here is a code example you could refer to.

static void Main(string[] args)  
        {  
            SendMessageWithEmbeddedImages();  
        }  
        public static void SendMessageWithEmbeddedImages()  
        {  
            string htmlMessage = @"<html>  
                         <body>  
                         <img src='cid:EmbeddedContent_1' />  
                         </body>  
                         </html>";  
            SmtpClient client = new SmtpClient("smtp.gmail.com");  
            client.Port = 587;  
            client.Credentials = new NetworkCredential("******@gmail.com", "Password");  
            client.EnableSsl = true;  
            MailMessage msg = new MailMessage("******@gmail.com",  
                                              "******@hotmail.com");  
            // Create the HTML view  
            AlternateView htmlView = AlternateView.CreateAlternateViewFromString(  
                                                         htmlMessage,  
                                                         Encoding.UTF8,  
                                                         MediaTypeNames.Text.Html);  
            // Create a plain text message for client that don't support HTML  
  
            string mediaType = MediaTypeNames.Image.Jpeg;  
            LinkedResource img = new LinkedResource(@"D:\2.jpg", mediaType);  
            // Make sure you set all these values!!!  
            img.ContentId = "EmbeddedContent_1";  
            img.ContentType.MediaType = mediaType;  
            img.TransferEncoding = TransferEncoding.Base64;  
            img.ContentType.Name = img.ContentId;  
            img.ContentLink = new Uri("cid:" + img.ContentId);  
            htmlView.LinkedResources.Add(img);  
            msg.AlternateViews.Add(htmlView);  
            msg.IsBodyHtml = true;  
            msg.Subject = "Some subject";  
            client.Send(msg);  
        }

Based on my test, the above method can send the email with embedded image successfully.

Please note that we need to enable Less secure app access in the link: Enable Less secure app.

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How send email with embedded image in base64 for Gmail?

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