小编典典

从C#发送带有附件的电子邮件,附件作为Thunderbird中的第1.2部分到达

c#

我有一个C#应用程序,可以使用SMTP通过Exchange
2007服务器通过电子邮件发送Excel电子表格报告。这些对于Outlook用户来说可以正常使用,但是对于Thunderbird和Blackberry用户,附件已重命名为“
1.2部分”。

我找到了描述问题的文章,但似乎没有给我解决方法。我无法控制Exchange服务器,因此无法在其中进行更改。在C#端我有什么可以做的吗?我曾尝试使用短文件名和HTML编码作为正文,但是两者都没有改变。

我的邮件发送代码就是这样的:

public static void SendMail(string recipient, string subject, string body, string attachmentFilename)
{
    SmtpClient smtpClient = new SmtpClient();
    NetworkCredential basicCredential = new NetworkCredential(MailConst.Username, MailConst.Password);
    MailMessage message = new MailMessage();
    MailAddress fromAddress = new MailAddress(MailConst.Username);

    // setup up the host, increase the timeout to 5 minutes
    smtpClient.Host = MailConst.SmtpServer;
    smtpClient.UseDefaultCredentials = false;
    smtpClient.Credentials = basicCredential;
    smtpClient.Timeout = (60 * 5 * 1000);

    message.From = fromAddress;
    message.Subject = subject;
    message.IsBodyHtml = false;
    message.Body = body;
    message.To.Add(recipient);

    if (attachmentFilename != null)
        message.Attachments.Add(new Attachment(attachmentFilename));

    smtpClient.Send(message);
}

谢谢你的帮助。


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2020-05-19

共1个答案

小编典典

显式填充ContentDisposition字段可以达到目的。

if (attachmentFilename != null)
{
    Attachment attachment = new Attachment(attachmentFilename, MediaTypeNames.Application.Octet);
    ContentDisposition disposition = attachment.ContentDisposition;
    disposition.CreationDate = File.GetCreationTime(attachmentFilename);
    disposition.ModificationDate = File.GetLastWriteTime(attachmentFilename);
    disposition.ReadDate = File.GetLastAccessTime(attachmentFilename);
    disposition.FileName = Path.GetFileName(attachmentFilename);
    disposition.Size = new FileInfo(attachmentFilename).Length;
    disposition.DispositionType = DispositionTypeNames.Attachment;
    message.Attachments.Add(attachment);                
}

顺便说一句 ,在使用Gmail的情况下,您可能对ssl安全甚至端口有一些例外!

smtpClient.EnableSsl = true;
smtpClient.Port = 587;
2020-05-19