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I'm storing my MailSettings in a web.config, however when I send the message, my SMTP server reports back that I need to use authentication. I've got my username/password in the config file, but it still fails. It works if I do the following, but it seems like an extra step. Shouldn't it just take it from the config file and use authentication automatically? System.Configuration.Configuration config = WebConfigurationManager.OpenWebConfiguration( HttpContext.Current.Request.ApplicationPath); MailSettingsSectionGroup settings = (MailSettingsSectionGroup) config.GetSectionGroup("system.net/mailSettings"); SmtpClient client = new SmtpClient(); client.Credentials = new NetworkCredential( settings.Smtp.Network.UserName, settings.Smtp.Network.Password); Web.config <system.net> <mailSettings> <smtp from="me@xyz.com" deliveryMethod="Network"> <network host="mail.xyz.com" defaultCredentials="true" userName="me@xyzcom" password="abc123" /> </smtp> </mailSettings> </system.net> System.Net.Mail.SmtpException Exceeded storage allocation. The server response was: Please use smtp authentication. See http://www.myISP.com/support/smtp-authentication.aspx The "Exceeded storage allocation" confused us for quite awhile, we now ignore it. It's the "use smtp authentication" that seems to be important.

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