Show the SMTP error that the mail was unable to send on View Workflow History page
We request to add a function that is to show the SMTP error that the mail was unable to send on View Workflow History page
We found the error was not showed if the mail is unable to send from “Send Notification” action causing by what the wrong mail address is registered on the user account.
However this error is generated on the Nintex Workflow category of ULS log.
Users are not able to note this issue that they are not able to receive the mail on time.

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Gonçalo commented
We had the same issue pointed out by Misayo and the great support of Kevin from Nintex. Because to my eyes, I do not necessarily think the WF should stop if the message is not sent, I guess we can see this issue with 2 different possible solutions:
1) New Feature: have an WF settings option to decide to stop the WF in case any of the actions errors or not which would mean considering the "message not sent" an error
2) Fix: Let the WF run further (as it is now) but acknowledge and report the error (“email not sent”) WF details.
Any of these would be great. Thanks and keep on the good job Nintex.
Cheers, Gonçalo -
Itebe commented
It would be great to have some kind of "mail check" due some times users are complaining about "I didn't received any email to this validation task (comming from a FlexiTask or similar Nintex action). So we have no way to ensure mails are correctly sent or not after Nintex action was executed.
Nintex Action has no errror, but SMTP is not sending mails--> How can we re-try to send or handle this situation? A "handle SMTP errors" option would be really necessary.
Best regards.