SecureLM setup and SMTP

I am just finishing up installing and configuring SecureLM on a Windows 2003 Server.
We have problems getting licenses emailed out. During our tests, the licenses is issued, but I get the following error --

Failed to send mail: System.Web.Services.Protocols.SoapException: Failed to send mail to System.Collections.ArrayList. at SecureLM.LicenseIssueWS.BaseService.RaiseException(Exception ex, String sData) at SecureLM.LicenseIssueWS.IssueService.SendIssueLicenseMail(String sProdId, String sPackageId, String sCustomerId, String sToEmail, String[] oActivationKeys, String sVendorId)

I am assuming the error lies in the General Settings and the Mail Settings.
Does anyone have a clue?

Thanks in advance

[837 byte] By [Amiguete] at [2008-2-12]