Could not send notification 65569 (status 'FAILED')

Question

Customize Workflow runs with 2006 error - only happen in the morning
We have created a customize workflow which works a bit funny here:
When we first run the workflow in the morning, it ends up with this error:
Activity Buyer Notifications
Result Mail
Error Name WFMLRSND_FAILED
Error Message 2006: Could not send notification 65569 (status 'FAILED') to 'CONTRACT SERVICES'.
Error Stack WF_MAIL.GetDocContent(PO_DETAILS_BUYER)
Then, thinking of some problem might happend to the workflow mailer, we run the standard workflow, e.g. PO Approval. It runs successfully and send out the notification email. So, we then run the customise workflow again, and this time it works, no error has been generated as above.
The funny thing is, this had happened more than a week, where every morning I have to somehow run a standard workflow (normally I just create a new PO and send for approval), and got my customize workflow run successfully.
Can someone highlight what's going wrong here?
Is that some setup or soemthing that contribute to this problem?
Thanks,
Patricia

Answer 1

The notifications are defined in the workflow but they do use a document type attribute (we send a table of data "Job", "Job Name", "Amounts").
We have changed the database packages a lot and that created many problems afterwards so we minimized when we make those changes and we restart everything (database, IAS Server) afterwards.
Here is the email to SYSADMIN:
=========================================================
Subject: Error in Workflow DUNAPIN2/20060323123955x30741282 2006: Could not send notification 41119 (status 'ERROR') to 'KKEMPER'.
From
To SYSADMIN
Sent 03-APR-06
Due
Notification ID 41121
An Error occurred in the following Workflow.
Item Type = DUNAPIN2
Item Key = 20060323123955x30741282
User Key =20060323123955x30741282
Error Name = WFMLRSND_FAILED
Error Message = 2006: Could not send notification 41119 (status 'ERROR') to 'KKEMPER'.
Error Stack = &ERROR_STACK
Activity Id = 52557
Activity Label = GET_GENERAL_LEDGER_APPROVAL:NTF_V2_AR_DEPT_OFF_MGR
Result Code = #MAIL
Notification Id = 41119
Assigned User = KKEMPER
Workflow monitor
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Any help would be greatly appreciated.
Jim