使用 DotnetOpenMail发送带附件的邮件

DotNetOpenMail.EmailMessage email = new DotNetOpenMail.EmailMessage();

email.FromAddress = new DotNetOpenMail.EmailAddress("zhifengwu1211@126.com");

DotNetOpenMail.EmailAddressCollection toAddresses = new DotNetOpenMail.EmailAddressCollection();
DotNetOpenMail.EmailAddress toAddress = new DotNetOpenMail.EmailAddress("zhifengwu1211@126.com");
toAddresses.Add(toAddress);
email.ToAddresses.Add(toAddress);

email.Subject = "this is test";
DotNetOpenMail.SmtpServer smtpserver = new DotNetOpenMail.SmtpServer("192.168.2.129");

StreamReader readfile = new StreamReader("d:\\mycert.cer");
Byte[] fileBytes = System.Text.Encoding.Default.GetBytes(readfile.ReadToEnd());

DotNetOpenMail.FileAttachment fileAttachment = new DotNetOpenMail.FileAttachment(fileBytes);
fileAttachment.FileName = "mycert.cer";
email.AddMixedAttachment(fileAttachment);

bool result=email.Send(smtpserver);

if (result == true)
this.label1.Text = "success";
else
this.label1.Text = "error";