Mailbox name not allowed. The server response was: sorry, Authentication failed or timed out. Please do get messages first to authenticate yourself.(#4.4.3)

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please provide solution.. the code working fine on local system but when deployed on rediff server it throwing above exception message.

my c# code is:

public void sendEmail(string emailId, string emailBody)
{
try
{
MailMessage mailtocand;
mailtocand = new MailMessage();
mailtocand.From = new MailAddress("MyEmail");
mailtocand.To.Add(new MailAddress(emailId));
mailtocand.Subject = "Subject";
mailtocand.IsBodyHtml = true;

mailtocand.Body = emailBody;
SmtpClient smtpmailclient = new SmtpClient();
smtpmailclient.Host = "smtp.rediffmailpro.com";
smtpmailclient.Port = 25;
smtpmailclient.Timeout = 10000;
smtpmailclient.DeliveryMethod = SmtpDeliveryMethod.Network;
smtpmailclient.UseDefaultCredentials = false;
smtpmailclient.Credentials = new NetworkCredential("MyEmail", "Password");

smtpmailclient.Send(mailtocand);
}
catch (Exception ex)
{
Response.Write(ex.Message);
}

}

Posted 6-Mar-14 0:35am

Sachin Vshishth

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Ramug10 · Answer 1 · 2014-03-06T00:48:00

Solution 1

Hi sachin,

Your SMTP server will not let you send mail to the target address.

You'll need to speak with whomever manages the smtp server or use a different one.

Make sure you have specified the correct user name and password in Host .

Please check the following link:

http://www.systemnetmail.com/

http://forums.asp.net/t/988184.aspx/1?+quot+Mailbox+name+not+allowed+The+server+response+was+sorry+your+mail+was+administratively+denied+5+7+1+quot+

Thanks,
-RG

Posted 6-Mar-14 0:48am

Ramug10

Comments

Sachin Vshishth 6-Mar-14 7:00am

Thanks RG, i tried all these options but still getting the same problem.

Ramug10 6-Mar-14 7:11am

The problem may be because of any of the below listed scenarios

1. Your SMTP server is not configured correctly to the PORT 25, open command prompt and enter this telnet smtp.rediffmailpro.com 25 and hit enter, if you see a message something like this "220 mailserver.domain.com Microsoft ESMTP MAIL Service, Version: 5.0.2195.5329 ready at Sat, 22 May 2006 08:34:14 +0200", then there isnt any problem in your SMTP configuration if not try to configure it correctly.

2. Assuming that your SMTP is correctly configured then check if the provided network credentials is a valid Entry in your mail system.

Subhash Konduru - Application Development · Answer 2 · 2014-03-06T00:50:00

Solution 2

Hi,

Did you try adding the following line to your code? Because some of the Public SMTP services [Like Gmail] are allowed only SSL connections.

smtpmailclient .EnableSsl = true;

And also please confirm whether the rediff Mail Service is accessible on the default SMTP port i.e. 25?

Gmail Uses 587 as the SMTP Port number for SMTP client connections.

If these suggestions fix your issue; please mark it as fixed.

Regards,
Subhash konduru

Posted 6-Mar-14 0:50am

Subhash Konduru - Application Development

Comments

Sachin Vshishth 6-Mar-14 7:03am

Thanks Subhash konduru, I found this port number from rediffmailpro settings>Outgoing server port: 25, also tried with both EnableSsl=true and false.

Subhash Konduru - Application Development 6-Mar-14 7:11am

Hi,

Also try the SMTP Server Name as "smtp.rediffmail.com".

You Should Try the Inbound Port Number as you are trying to send the email through the Application to the Reddiff Mail Server. Please let me know if you find any solution to this problem. If the issue is resolved; Mark it is answered.

Regards,
Subhash Konduru

Bernhard Hiller · Answer 3 · 2014-10-06T20:41:00

Solution 4

Quote:
do get messages first to authenticate yourself.(#4.4.3)

Looks like that server is configured to require POP before SMTP.
That means: you have to do a POP3 request BEFORE you can send an SMTP request.

Posted 6-Oct-14 20:41pm

Bernhard Hiller

Comments

ManojanbU 11-Jul-16 9:14am

"That means: you have to do a POP3 request BEFORE you can send an SMTP request".i cant clear this. can you give more explanation ?

jagdish123061 · Answer 4 · 2014-10-06T01:15:00

Solution 3

Just change port from 25 to 587 and enablessl to false

Posted 6-Oct-14 1:15am

jagdish123061