System.Net.Mail.SmtpException: The operation has timed out.

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I'm getting this error on my vb.net application after sending the email login notification to 10 users:

- System.Net.Mail.SmtpException: The operation has timed out. at System.Net.Mail.SmtpClient.Send(MailMessage message)

the server that i'm using as a mail server is a linux centos server with postfix configuration ...

note: their is no support to contact for help on my server since i installed the web panel

any suggestion that can help me??

thanks..

Posted 28-Nov-14 4:38am

Hidhoud1991

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hypermellow 28-Nov-14 11:15am

Can you and your users telnet to the mail server on the port your using?
Also, if you're trying to connect on port 25, sometimes antivirus/firewalls are setup to block these connections.

Hidhoud1991 28-Nov-14 11:27am

the port 25 is blocked by our isp so we opened the port 587 and the server works and we are receiving mail from it but after 10 emails sent from our application the error appears ... is there anything we missed in our smtp server configuration on the server. or it is a server configuration.

hypermellow 28-Nov-14 11:38am

When operation timeout occurs, try connecting via telnet:
http://www.port25.com/how-to-check-an-smtp-connection-with-a-manual-telnet-session-2/

I don't know too much about mail server setups on linux, but if you can't connect via telnet, then at least your dealing with a server issue.

Hope it helps.

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