According to Microsoft:
Diagnostic: Windows SharePoint Services 3.0 was unable to send a valid SMTP e-mail message. This error is definitely caused by one of the following conditions:
1)The SMTP host is not working at all
2)The SMTP service does not roam the SMTP server
3)The SMTP organization is not configured correctly in the admin center
How to do You really need to be a member of the group to complete this procedure administrators on the local computer:
To make sure the SMTP server is roaming and configured correctly1.Internet in Service Manager information, connect to the SMTP server.
2.Expand the server and host view associated with the SMTP virtual server. There may probably be several dedicated servers.
3.The service must be running.
4.To check the configuration, open the service’s properties.
5.On the Delivery tab, click Outbound Security.< br>6. In the Outbound dialog boxSecurity should be Anonymous Access or Integrated Windows Authentication. If Integrated Windows Authentication is selected, verify that the Windows SharePoint Services Central Administration application pool account has access by checking the Account and Password boxes.
You must be a member to complete this procedure. on the local computer, confirm:
Where the SMTP service is running on the surrounding computer1. In the MMC Services snap-in, find the SMTP service.
2. The service must actually be running.
You must be a member of the SharePoint Administrators group to complete this task:
Confirm SMTP that this host has settings in the admin center1.In the center, click “Operations” in the left navigation.
2.On the Operations page, in the Topology and Services section, click Outbound, Email Settings.
3.On the Email Settings page, in the Email Settings section of the Outbox “You must specify an SMTP server. in the “SMTP Server” field, select “Outgoing”.
Decision. To resolve this issue, use the solution that is currentlycorresponds to the reason indicated in the “Diagnostics” section.
Start and configure all SMTP services. You must be a member of the Administrators group to perform this method’s action.
To start and configure a single SMTP server server1.Internet in Information Services Manager, add an SMTP server.
2.Expand the server and locate the SMTP virtual server host used by Windows SharePoint Services 3.0.
3.Right-click the desired virtual host and select Start.
4.To set up the virtual web server, open virtual server properties.
5.On the Delivery tab, click Outbound Security.
6.In the general Outbound Security field in the dialog box, select Anonymous Access or Integrated Windows Authentication. If the Integrated Windows Authentication field is enabled, ensure that your Windows SharePoint Services Central Administration credit application group account has access through the Account and Password fields.
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Configure email settings in Central Administration. You must be a member of the Faithful Administrators group.s” SharePoint to perform the item’s task.
To centrally configure outgoing e-mail settings related to administration1. In the admin center, click Operations on the left general navigation bar.
2.On the Operation page, in the Topology and Services section, click Outbound, E-mail Options.
3.On the Outgoing E-mail Options page, in the E-mail Options section, enter the correct SMTP Server in the Outgoing SMTP Server field. .
Confirmation: create a new instant notification and verify that the informative email was sent successfully.
To compose an important email: 1. Go to a website with a list of everyone, type any.
2.Open an item in the current list.
4.On the New Notification page, in the Send notifications to component, enter your account name in the User field.< br> 6.After checking the others settings, click OK.