I was using nintex workflow for reminder in my one SP list. it was working fine, but some day back I am not getting the reminder emails and when I check I got the following error
failed to send notification. An invalid character was found in the email header':'
there was no change in work-flow etc, I also remove the TO and CC email by re-selecting the emails but getting same errors. please help as this is urgent for me.
In the subject line of the email use the inline function XmlEncode. The below Subject line sends with no issues.
Let me know if this works for you.
I am facing the same issue. Workflow failed to send notifications in one site collection. i created test workflow in different site collection to execute. it ran successfully without any errors. Please help me resolve this issue.
We faced the same issue on SharePoint 2016. We tried un-checking the box for "Send individually addressed notifications" checkbox.. even for notifications with one email address and then it worked fine...
I personally think it is a bug in Nintex 2016... we got a ticket open with support..
Also in some situations, if you checked the box to include attachments from the list item and the attachment name includes special characters, sharepoint will throw the same error. you gotta fix the attachment name and re-run the workflow.