ASP.NET cannot sent email from smtp

Question

back to my previous question. I am still have problem with sending email by Gmail SMTP. Previously i had error that:

Failure sending mail.

But now i changed some code and now i have his error:

A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond 64.233.167.109:465

I was so pissed off, that I started using wireshark to understand where the problem.

Here is what i found:

smtp.gmail.com Server: 53.90.35.60 Address: 53.90.35.60#53

Non-authoritative answer: smtp.gmail.com canonical name = gmail-smtp-msa.l.google.com. Name: gmail-smtp-msa.L.google.com Address: 64.233.167.108 Name: gmail-smtp-msa.L.google.com Address: 64.233.167.109

so as I understand there is response received from mail smtp server

Also we use proxy in our intranet, but I added proxy in my application, inside Web.config:

<system.net>
<defaultProxy enabled="true">
  <proxy proxyaddress="proxy_was_here" bypassonlocal="true"
  />
</defaultProxy>

and here is the part of new code:

var fromAddress = new MailAddress("email", "From Name");
                    var toAddress = new MailAddress("email", "To Name");
                    const string fromPassword = "pass";
                    const string subject = "Subject";
                    const string body = "Body";

                    var smtp = new SmtpClient
                    {
                        Host = "smtp.gmail.com",
                        Port = 465,
                        EnableSsl = true,
                        DeliveryMethod = SmtpDeliveryMethod.Network,
                        UseDefaultCredentials = false,
                        Credentials = new NetworkCredential(fromAddress.Address, fromPassword)
                    };
                    using (var message = new MailMessage(fromAddress, toAddress)
                    {
                        Subject = subject,
                        Body = body
                    })
                    {
                        smtp.Send(message);
                    }

If you have any questions, please look at my previous question or just write in the comments below.

Have you tried port 587? Also, email send functionality not working on both host server and local development machine? — Mohsin Mehmood, Aug 16 '18 at 05:51
@MohsinMehmood Yes i tried all ports and it doesn't work on server neither — Bogdan Zubar, Aug 16 '18 at 06:11

score 0 · Answer 1 · answered Aug 16 '18 at 06:52

0

Please try with port number 587 and EnableSSL = false

var smtp = new SmtpClient
{
   Host = "smtp.gmail.com",
   Port = 587,
   EnableSsl = true,
   DeliveryMethod = SmtpDeliveryMethod.Network,
   UseDefaultCredentials = false,
   Credentials = new NetworkCredential(fromAddress.Address, fromPassword)
 };

also check with your credentials in https://www.smtper.net/

and also allow for less secure app from this link : https://myaccount.google.com/lesssecureapps?pli=1

answered Aug 16 '18 at 06:52

Akhatarali Ansari

70
2
14

That really weird it doesn't work at all (Gmail and Yahoo) – Bogdan Zubar Aug 16 '18 at 07:11
please try this, MailMessage mail = new MailMessage(from, to); mail.Subject = "Subject"; mail.Body = "Body";//Console.ReadLine(); SmtpClient smtp = new SmtpClient(); smtp.Host = "smtp.gmail.com"; smtp.Port = 587; smtp.Credentials = new NetworkCredential("email-id", "password"); smtp.EnableSsl = true; smtp.Send(mail); if you body not contains any HTML code then set isHtmlBody = false; – Akhatarali Ansari Aug 16 '18 at 07:23
I turned on less secure app also in yahoo and it works on this website. But still doesn't work in my app. SMTP host: smtp.mail.yahoo.com Port: 587 Use SLL: True Use Authentication: True – Bogdan Zubar Aug 16 '18 at 07:27

ASP.NET cannot sent email from smtp

1 Answers1