无法使用 C# 向多个地址/收件人发送电子邮件 [英] Unable to send an email to multiple addresses/recipients using C#

问题描述

我正在使用以下代码，它只发送一封电子邮件 - 我必须将电子邮件发送到多个地址.

为了收到不止一封电子邮件，我使用:

string connectionString = ConfigurationManager.ConnectionStrings["email_data"].ConnectionString;OleDbConnection con100 = 新 OleDbConnection(connectionString);OleDbCommand cmd100 = new OleDbCommand("从bulk_tbl中选择前3封邮件", con100);OleDbDataAdapter da100 = 新 OleDbDataAdapter(cmd100);数据集 ds100 = 新数据集()；da100.Fill(ds100);for (int i = 0; i < ds100.Tables[0].Rows.Count; i++)//尝试{字符串 all_emails = ds100.Tables[0].Rows[i][0].ToString();{string allmail = all_emails + ";";Session.Add("ad_emails",allmail);Response.Write(Session["ad_emails"]);发送邮件();}}

以及发送我使用的电子邮件:

string sendto = Session["ad_emails"].ToString();MailMessage message = new MailMessage("[e-mail]", sendto, "subject", "body");SmtpClient emailClient = new SmtpClient("mail.smtp.com");System.Net.NetworkCredential SMTPUserInfo = new System.Net.NetworkCredential("abc", "abc");emailClient.UseDefaultCredentials = true;emailClient.Credentials = SMTPUserInfo;emailClient.Send(message);

解决方案

问题是当 MailMessage 构造函数只接受一个字符串时，你提供了一个由分号分隔的地址列表表示单个地址:

<块引用>

包含电子邮件收件人地址的字符串.

或者可能是用逗号分隔的列表(见下文).

来源

要指定多个地址，您需要使用 To 属性，它是一个 MailAddressCollection，虽然这些页面上的示例没有很清楚地显示它:

message.To.Add("[e-mail], [e-mail]"));

<块引用>

要添加到 MailAddressCollection 的电子邮件地址.多个电子邮件地址必须用逗号字符 (",") 分隔.

MSDN 页面

因此创建带有 逗号 分隔列表的 MailMessage 应该可以工作.

I am using the below code, and it only sends one email - I have to send the email to multiple addresses.

For getting more than one email I use:

string connectionString = ConfigurationManager.ConnectionStrings["email_data"].ConnectionString;
OleDbConnection con100 = new OleDbConnection(connectionString);
OleDbCommand cmd100 = new OleDbCommand("select top 3 emails  from bulk_tbl", con100);
OleDbDataAdapter da100 = new OleDbDataAdapter(cmd100);
DataSet ds100 = new DataSet();
da100.Fill(ds100);

    for (int i = 0; i < ds100.Tables[0].Rows.Count; i++)
    //try
    {
        string all_emails = ds100.Tables[0].Rows[i][0].ToString();
        {
            string allmail = all_emails + ";";
            Session.Add("ad_emails",allmail);
            Response.Write(Session["ad_emails"]);
            send_mail();
        }
    }

and for sending the email I use:

string sendto = Session["ad_emails"].ToString();

MailMessage message = new MailMessage("[e-mail]", sendto, "subject", "body");
SmtpClient emailClient = new SmtpClient("mail.smtp.com");
System.Net.NetworkCredential SMTPUserInfo = new System.Net.NetworkCredential("abc", "abc");
emailClient.UseDefaultCredentials = true;
emailClient.Credentials = SMTPUserInfo;
emailClient.Send(message);

解决方案

The problem is that you are supplying a list of addresses separated by semi-colons to the MailMessage constructor when it only takes a string representing a single address:

A String that contains the address of the recipient of the e-mail message.

or possibly a list separated by commas (see below).

Source

To specify multiple addresses you need to use the To property which is a MailAddressCollection, though the examples on these pages don't show it very clearly:

message.To.Add("[e-mail], [e-mail]"));

The e-mail addresses to add to the MailAddressCollection. Multiple e-mail addresses must be separated with a comma character (",").

MSDN page

so creating the MailMessage with a comma separated list should work.

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