编辑 我使用以下代码在 C# 中发送批量电子邮件。但是,当其中一个收件人的电子邮件地址无效时,即使电子邮件地址有效的其他收件人也不会发送电子邮件,我遇到了一个例外:
system.net.mail.smtpfailedrecipientsexception 收件人失败
即使其中一个电子邮件地址无效,有什么方法可以将电子邮件发送给其他有效的收件人?
public void SendMailMessage (string[] to,string message,string subject)
{
MailMessage mMailMessage = new MailMessage ();
int lenght = to.GetLength(0);
if (lenght > 1) {
foreach (string email in to) {
mMailMessage.Bcc.Add ( email );
}
}
else {
mMailMessage.To.Add ( to[0] );
}
mMailMessage.From = new MailAddress ("no-replay@mycompany.net");
SmtpClient mSmtpClient = new SmtpClient ();
mMailMessage.Body = message;
mMailMessage.IsBodyHtml = true;
mMailMessage.Priority = MailPriority.Normal;
mMailMessage.Subject = subject;
mSmtpClient.EnableSsl = true;
ServicePointManager.ServerCertificateValidationCallback = delegate(object s,X509Certificate certificate,X509Chain chain, SslPolicyErrors sslPolicyErrors) {return true;};
try {
mSmtpClient.Send (mMailMessage);
}
catch (SmtpFailedRecipientsException ex){
for (int i = 0; i < ex.InnerExceptions.Length; i++)
{
SmtpStatusCode status = ex.InnerExceptions[i].StatusCode;
if (status == SmtpStatusCode.MailboxBusy ||
status == SmtpStatusCode.MailboxUnavailable)
{
Logger.Debug("Delivery failed - retrying in 5 seconds.");
System.Threading.Thread.Sleep(5000);
//client.Send(message);
mSmtpClient.Send (mMailMessage);
}
else
{
Logger.Debug (string.Format ("Failed to deliver message to {0},{1}", ex.InnerExceptions[i].FailedRecipient, i));
}
}
}
catch (Exception ex)
{
Logger.Debug (string.Format("Exception caught in RetryIfBusy(): {0}", ex.ToString() ));
}
}
此外,在我将字符串电子邮件地址发送到 SendMailMessage 方法之前,我通过这种方法检查它们是否有效:
public bool IsValidEmail(string emailaddress)
{
try
{
MailAddress m = new MailAddress(emailaddress);
return true;
}
catch (FormatException)
{
return false;
}
}