I'm installing latest versión of mojoportal on an production server. I'm testing blog module, but when I try to give a feedback, application crashes and shows the following messages, what else must I configure in order to solve this problem?

Server Error in '/' Application.

The parameter 'address' cannot be an empty string.

Parameter name: address

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.ArgumentException: The parameter 'address' cannot be an empty string.

Parameter name: address

Source Error:

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.

Stack Trace:

[ArgumentException: The parameter 'address' cannot be an empty string.

Parameter name: address]

System.Net.Mail.MailAddress..ctor(String address, String displayName, Encoding displayNameEncoding) +1098157

System.Net.Mail.MailAddress..ctor(String address) +8

mojoPortal.Net.Email.SendEmailNormal(SmtpSettings smtpSettings, String from, String replyTo, String to, String cc, String bcc, String subject, String messageBody, Boolean html, String priority, String[] attachmentPaths, String[] attachmentNames) +621

mojoPortal.Net.Email.SendEmailNormal(SmtpSettings smtpSettings, String from, String replyTo, String to, String cc, String bcc, String subject, String messageBody, Boolean html, String priority) +122

mojoPortal.Net.Email.SendEmailNormal(SmtpSettings smtpSettings, String from, String to, String cc, String bcc, String subject, String messageBody, Boolean html, String priority) +77

mojoPortal.Net.Email.SendEmail(SmtpSettings smtpSettings, String from, String to, String cc, String bcc, String subject, String messageBody, Boolean html, String priority) +595

mojoPortal.Net.Notification.SendBlogCommentNotificationEmail(SmtpSettings smtpSettings, String messageTemplate, String fromEmail, String siteName, String authorEmail, String messageLink) +200

mojoPortal.Web.BlogUI.BlogViewControl.btnPostComment_Click(Object sender, EventArgs e) +2256

System.Web.UI.WebControls.Button.OnClick(EventArgs e) +111

System.Web.UI.WebControls.Button.RaisePostBackEvent(String eventArgument) +110

System.Web.UI.WebControls.Button.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument) +10

System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument) +13

System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData) +175

System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1565

Version Information: Microsoft .NET Framework Version:2.0.50727.3082; ASP.NET Version:2.0.50727.3082