Error with Sending Mail via website

Question

Hello Forum,
I need your help in resolving an issue I am currently facing. I cannot send mail from my website
to another email address. Before hosting my site, I tested it and it worked but ever since I hosted
my website it has not been working. I really do not know what could cause the error. All the login
credentials are correct but I keep getting the error. Please I really need help and direction to resolve this.
I am using office365 as my mail
Here is my code behind:

 using (MailMessage mm = new MailMessage("help@josmade.com", mailtxtbx.Text))
        {
            mm.Subject = "Account Activation";
            string body = "Hello " + txtname.Text.Trim() + ",";
            body += "<br /><br />Your Registration was successful.";
            body += "<br /><br />Please click the Button below to activate your account";
            body += "<br /><br /><a style='display: block; width: 130px; height: 15px; background: #355171;padding: 10px;font-family: Nunito; text-align:center; border-radius: 5px;color: white;font-weight: bold;text-decoration: none;' href = '"
            + Request.Url.AbsoluteUri.Replace("signup", "AccountActivation.aspx?ActivationCode="
            + activationCode) + "'>Click here to activate your account.</a>";
            body += "<br /><br />Thanks";
            mm.Body = body;
            mm.IsBodyHtml = true;

            SmtpClient SMTP = new SmtpClient("smtp.office365.com", 587);
            SMTP.UseDefaultCredentials = false;
            SMTP.Credentials = new NetworkCredential()
            {
                UserName = "help@josmade.com",
                Password = "xxxxxxxxxxxxx"
            };
            SMTP.EnableSsl = true;
            SMTP.Send(mm);
        }

Answer 1

Hi @Donald Symmons ,
You can try the following methods:

• Check if the server OS hosting your website has a firewall rule to deny it.
• You can check if something else is using the port with netstat:
  netstat -ano | findstr <your port number>
• If nothing is already using it, the port might be excluded, try this command to see if the range is blocked by something else:
  netsh interface ipv4 show excludedportrange protocol=tcp
• Try to restart the Host Network Service on windows service program.
  net stop hns
net start hns
• Restarting the Internet Information Services (IIS):
  iisreset

Best regards,
Lan Huang

---

If the answer is the right solution, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.