Some mail get stuck in Queue folder

Question

User1886661451 posted

I have a web application created in .NET.

I use smtp to send mail. Most of the mail gets send normally. But some mail will not arrive. I've found out that that got stuck in the folder C:\Inetpub\Mailroot\Queue.

Obviously (I think) the configuration of SMTP is not the problem here, or all mail would not be send.

Can anyone help me to solve this problem?

Answer 1

User1183424175 posted

Hi,

You can try disable or enlarge the value of "Limit number of connections to". In IIS manager, SMTP Virtual Server > Properties > Delievery > Outbound Connections.

And please check if event log has some error messages. For more information, please refer to the document:

http://serverfault.com/questions/102865/iis-smtp-emails-are-stuck-in-mailroot-queue

http://stackoverflow.com/questions/23540742/iis-smtp-messages-stuck-in-inetpub-mailroot-queue

Answer 2

User1886661451 posted

Unfortunately, the proposed solution doesn't work. I disabled Limit number of connections to no avial. The logfile shows this info after activating and sending mail to an address that I know has a problem:

#Software: Microsoft Internet Information Services 8.0
#Version: 1.0
#Date: 2015-05-16 13:45:44
#Fields: time c-ip cs-method cs-uri-stem sc-status
13:45:44 212.54.34.8 - - 0
13:45:44 212.54.34.8 EHLO - 0
13:45:44 212.54.34.8 - - 0
13:45:44 212.54.34.8 HELO - 0
13:45:44 212.54.34.8 - - 0
13:45:44 212.54.34.8 QUIT - 0
13:45:44 212.54.34.8 - - 0
13:46:06 127.0.0.1 EHLO - 250
13:46:06 127.0.0.1 MAIL - 250
13:46:06 127.0.0.1 RCPT - 250
13:46:06 127.0.0.1 DATA - 250

I have googled on this info, but it didn't do any good. All I think it means is that everything is okay.

The info in the links doesn't help me. The point is, I have a webapplication for a client that has to send e-mails to member of different companies, so, different domains. My server is a VPS,is not in a domain and there is no DNS. Most of the mails arrive without a problem. Some mail end up in the queue folder.

I have added the IP-address of the server to Properties - General - Advanced. But it didn't help

In my C# code I've changed the localserver in the value below. But than it wouldn't send at all.

SmtpClient SmtpMail = new SmtpClient("address server");