I also found this, and spent hours on this before I discovered that only the "oneshot" type of search does the issue present.   Submitted https://github.com/splunk/splunk-sdk-python/issues/678  on it.  convert your reader var to a list, then iterate through it to resolve, like: reader = JSONResultsReader(result_stream) reader2 = list(reader) for item in reader2: print(item) ... View more

I resolved the same error, for myself, by specifying a from address as an argument to the sendemail command, from=addy@domain.com ... ... View more