In my SharePoint 2013 environment, I have a approval workflow that configure to send mail at each level of approval, to concern person. The issue is, some time mail triggered successfully and some time not within a single thread of process(with the work flow status: The e-mail message cannot be sent. Make sure the outgoing e-mail settings for the server are configured correctly)
Even I tried it while keeping the same mail account all level of approval it just send mail randomly a any level of the approval but not at all level of approval.
I thought, there might be something wrong with my workflow, so I configure the alert (at all events) on some list and libraries too. But here also some time mail triggered and some not.
any body have any suggestion on it !!!