sending email to smtp via Visual Studio developer

Question

I am attempting to deliver a email message when i run my webform page to my personal email server address at Yahoo named [email protected] using my visual studio developer connected to internet. I am unable to succesfully send a message?

protected void btnSendEmail_Click(object sender, EventArgs e)
{
try
{
MailMessage message = new MailMessage();
SmtpClient smtp = new SmtpClient();
message.From = new MailAddress("[email protected]");
message.To.Add(new MailAddress("[email protected]"));
message.Subject = "Test";
message.IsBodyHtml = true; //to make message body as html
message.Body = "";
smtp.Port = 587;
smtp.Host = "smtp.mail.yahoo.com"; //for gmail host
smtp.EnableSsl = true;
smtp.UseDefaultCredentials = false;
smtp.Credentials = new NetworkCredential("[email protected]", "testbedemail");
smtp.DeliveryMethod = SmtpDeliveryMethod.Network;
smtp.Send(message);
}
catch (Exception) { }
}

Sachin Singh · Answer

test with port 465 and provider smtp.yahoo.com protected void btnSendEmail_Click(object sender, EventArgs e) { try { MailMessage message = new MailMessage(); SmtpClient smtp = new SmtpClient(); message.From = new MailAddress( "dog@yahoo.co.uk" ); message.To.Add( new MailAddress( "peter@yahoo.co.uk" )); message.Subject = "Test" ; message.IsBodyHtml = true ; message.Body = "" ; smtp.Port = 465; // or 995 smtp.Host = "smtp.yahoo.com" ; // or smtp.mail.yahoo.com smtp.EnableSsl = true ; smtp.UseDefaultCredentials = false ; smtp.Credentials = new NetworkCredential( "dog@yahoo.co.uk" , "testbedemail" ); smtp.DeliveryMethod = SmtpDeliveryMethod.Network; smtp.Send(message); } catch (Exception) { } }

Rijwan Ansari · Answer

Hi, Sometimes you get this error if TSL 1.2 is not enable in your operating system. Here the SMTP, with port and SSL/TSL. smtp.mail.yahoo.com 25, 587 TLS smtp.mail.yahoo.com 465 SSL You can enable TSL https://www.emailarchitect.net/easendmail/kb/tls.aspx?cat=0 Also add this line of code after port. oServer.ConnectType = SmtpConnectType .ConnectSSLAuto; //for ssl

peter · Answer

error message responds: Smtp server returned an invalid response. Is it possible to connect directly using this method or do you need a mail app like outlook ?

Md Sarfaraj · Answer

Hello Peter, Please check the below article might be it will help you. https://www.c-sharpcorner.com/article/sending-email-using-c-sharp/

peter · Answer

Another thing i found with sending messages is that when delivering to a list of recipient addresses i am unable to verify delivery status response from server that would inform whether email sent successfully to all entries.

Jignesh Kumar · Answer

Hi Peter, For Yahoo, you need to change port and host, smtpClient.Host = "smtp.yahoo.com" ; // or smtp.mail.yahoo.com smtpClient.Port = 465; //or 995 Please refer this link for different host like yahoo, gmail, hotmail etc, https://www.aspforums.net/Threads/471485/How-to-send-email-from-Yahoo-Gmail-Hotmail-using-C-and-VBNet-in-ASPNet/

peter · Answer

Once connected to my yahoo account and i send a link url in message i am able to click that link and return to the my webpage that resides on my local machine. Can i also set up my computer to connect to my website from another computer?

Leon D · Answer

Hi, Try this: https://www.e-iceblue.com/Tutorials/Spire.Email/Spire.Email-Program-Guide/Send-Email-with-HTML-Body-in-C-VB.NET.html

peter · Answer

I followed your advice and managed to get it to work eventually. That default credentials was an important part i had missing thanks. Now that i got a connection i tried setting up createuserwizard to deliver the email on user registration. I used a example code but when i added the embeddedobject template file to add image/textfile to output html file it prevents me from setting e.body.message in code behind and returns empty string value instead. Is there another approach to what i want to achieve ?

Sonil Kumar · Answer

try smtp.UseDefaultCredentials = true ; Also, confirm your yahoo mailbox for any alert messages. If you have tried it many times they will block your device for further communication and you will not able to send the message from that application.

sending email to smtp via Visual Studio developer

Answers (10)