How to show one of the recipient mail id is invalid is wrong [Resolved]

Alternatively you can check below links for valid/invalid mail-ids:-
http://developergeeks.com/article/271/how-to-verify-the-email-address-is-valid-in-aspnet
http://www.dotnetheaven.com/article/check-the-valid-email-and-invalid-email-address-in-vb.net
http://www.daniweb.com/web-development/php/threads/141944/check-if-email-address-is-correct-without-sending-email

Hope this helps you.

Sankar20092010, if this helps please login to Mark As Answer. | Alert Moderator

Hi, you can check like below:-
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)
{
// Console.WriteLine("Delivery failed - retrying in 5 seconds.");
System.Threading.Thread.Sleep(5000);
mailclient.Send(mail);
}
else
{
// Console.WriteLine("Failed to deliver message to {0}", ex.InnerExceptions[i].FailedRecipient);
throw ex;
}
}
}

Sankar20092010, if this helps please login to Mark As Answer. | Alert Moderator

you can check this method also by send mail to recipient mail id,and see that mail is deliver or not,
or check this link also in it solution is given,

dotnettutroialforu.blogspot.in/2013/06/check-emailid-already-exists-or-not-in.html

i hope this will help you,

Thanks&Regards,
Ketan Italiya

mark this answer if it will really help you,

Thanks&Regards
ketan

Sankar20092010, if this helps please login to Mark As Answer. | Alert Moderator