尝试从 ASP.NET 页面通过 SMTP 发送电子邮件时出现权限问题

Question

我以前这样做过，没有任何问题，但现在我不知道出了什么问题。我有一个带有电子邮件按钮的网页，我想使用该按钮将一些数据发送到电子邮件地址。

我向我们的网络托管公司询问服务器详细信息，得到的答复是：

"You can use the following details for mail.

Incoming mail server: mail.ourSite.com Outgoing mail server: mail.ourSite.com

Username and password are the email address and password associated with the email address.
"

我不确定最后一行，但我在网络主机的控制面板中创建了一个新的电子邮件地址。

我使用的代码是：

// instantiate a new mail definition and load an html
// template into a string which I replace values in
// then the rest of the code below
md.Subject = String.Format("{0} {1} {2}", emailSubject, firstName, lastName);

MailMessage msg = md.CreateMailMessage(emailAddress, replacements, emailBody, new Control());
md.IsBodyHtml = true;
SmtpClient sc = new SmtpClient(emailServer);            
sc.Credentials = new NetworkCredential(emailUsername, emailPassword);
    try
    {
        sc.Send(msg);
    }

emailServer - mail.ourSite.com（本文中的虚拟值） emailUsername - 我在控制面板中创建的电子邮件地址 emailPassword - 上面电子邮件的密码

我遇到的错误是，当我将电子邮件发送到我们自己的域之外的其他域时，我会收到

"Bad sequence of commands. The server response was: This mail server requires authentication when attempting to send to a non-local e-mail address. Please check your mail client settings or contact your administrator to verify that the domain or address is defined for this server."

当我向我们主机内的地址发送电子邮件时，它工作正常。

支持不是很支持，所以我在这里问您认为问题可能是什么？我觉得很奇怪，我使用了自己创建的电子邮件地址的密码，真的应该这样吗？

Answer 1

我认为您为 NetworkCredential 使用了错误的电子邮件地址。它应该是您从提供 emailServer 的电子邮件帐户获得的帐户。

Answer 2

试试这个..

    msg.UseDefaultCredentials = false;
    NetworkCredential MyCredential = new NetworkCredential("Email", "Password");
    msg.Credentials = MyCredential;

Answer 3

这是发送邮件的代码..
我希望我对你有帮助..

using System.Web.Mail;
using System;
public class MailSender
{
    public static bool SendEmail(
        string pGmailEmail, 
        string pGmailPassword, 
        string pTo, 
        string pSubject,
        string pBody, 
        System.Web.Mail.MailFormat pFormat,
        string pAttachmentPath)
    {
    try
    {
        System.Web.Mail.MailMessage myMail = new System.Web.Mail.MailMessage();
        myMail.Fields.Add
            ("http://schemas.microsoft.com/cdo/configuration/smtpserver",
                          "smtp.gmail.com");
        myMail.Fields.Add
            ("http://schemas.microsoft.com/cdo/configuration/smtpserverport",
                          "465");
        myMail.Fields.Add
            ("http://schemas.microsoft.com/cdo/configuration/sendusing",
                          "2");
        //sendusing: cdoSendUsingPort, value 2, for sending the message using 
        //the network.

        //smtpauthenticate: Specifies the mechanism used when authenticating 
        //to an SMTP 
        //service over the network. Possible values are:
        //- cdoAnonymous, value 0. Do not authenticate.
        //- cdoBasic, value 1. Use basic clear-text authentication. 
        //When using this option you have to provide the user name and password 
        //through the sendusername and sendpassword fields.
        //- cdoNTLM, value 2. The current process security context is used to 
        // authenticate with the service.
        myMail.Fields.Add
        ("http://schemas.microsoft.com/cdo/configuration/smtpauthenticate","1");
        //Use 0 for anonymous
        myMail.Fields.Add
        ("http://schemas.microsoft.com/cdo/configuration/sendusername",
            pGmailEmail);
        myMail.Fields.Add
        ("http://schemas.microsoft.com/cdo/configuration/sendpassword",
             pGmailPassword);
        myMail.Fields.Add
        ("http://schemas.microsoft.com/cdo/configuration/smtpusessl",
             "true");
        myMail.From = pGmailEmail;
        myMail.To = pTo;
        myMail.Subject = pSubject;
        myMail.BodyFormat = pFormat;
        myMail.Body = pBody;
        if (pAttachmentPath.Trim() != "")
        {
            MailAttachment MyAttachment = 
                    new MailAttachment(pAttachmentPath);
            myMail.Attachments.Add(MyAttachment);
            myMail.Priority = System.Web.Mail.MailPriority.High;
        }

        System.Web.Mail.SmtpMail.SmtpServer = "smtp.gmail.com:465";
        System.Web.Mail.SmtpMail.Send(myMail);
        return true;
    }
    catch (Exception ex)
    {
        throw;
    }
}
}