SharePoint Designer 2007 Send Email Workflow Sporadically Working or Gives an Error: The e-mail message cannot be sent. Make sure the outgoing e-mail settings for the server are configured correctly.

SPD 2007 Send Email Workflow Sporadically Working or Gives an Error: The e-mail message cannot be sent. Make sure the outgoing e-mail settings for the server are configured correctly.

WIERD… 🙁

Problem Detail:

I have created a very simple workflow on SPD 2007 on new item added to a list, as response I will get a mail as I define my email id in the workflow. Sometimes, it works and sometimes shows error(The e-mail message cannot be sent. Make sure the outgoing e-mail settings for the server are configured correctly).

As after a lot of googling, I found Antivirus, System Account related issue but none of them are matched to my condition.

Please help.

Thanks in advance.