can't send an alert email with "ERROR:root:'NoneType' object has no attribute 'find' while sending mail to..."?

[perlish]

The alert triggers and Splunk tries to send the alert email, but something is wrong.
In the internal log, I find this one error:

03-02-2016 19:22:04.376 +0800 ERROR ScriptRunner - stderr from '/data/splunk/bin/python /data/splunk/etc/apps/search/bin/sendemail.py "results_link=http://linuxscan:8000/app/asset_discovery/@go?sid=scheduler__admin_YXNzZXRfZGlzY292ZXJ5__RMD51f09c7f374d6ba97_at_1456917720_400" "ssname=危险端口开启告警" "graceful=True" "trigger_time=1456917721" results_file="/data/splunk/var/run/splunk/dispatch/scheduler__admin_YXNzZXRfZGlzY292ZXJ5__RMD51f09c7f374d6ba97_at_1456917720_400/results.csv.gz"': ERROR:root:'NoneType' object has no attribute 'find' while sending mail to: test@test.com

Server information:
6.3.0
Splunk internal version
aa7d4b1ccb80

Installed app:
Asset Discovery
version
6.0
internal version
10

[canuzun]

I believe there is a minor bug here. In the Email settings page "Send mail as" field is optional, however on sendemail.py file, this field is required. It is being used without any null/none check on line 96.

When i enter a valid sender address i get no error, if i dont enter i get "'NoneType' object has no attribute 'find' while sending mail to: ...." error.

sendemail.py code;
# make sure the sender is a valid email address
if sender.find("@") == -1:
sender = sender + '@' + socket.gethostname()
if sender.endswith("@"):
sender = sender + 'localhost'*

I face this issue in;
Splunk Version Splunk Light Version 6.4.1
Splunk Build debde650d26e

[perlish]

when trigger sendemail all log (include "info" log)

link text

[Yasaswy]

Hi perlish, it will be difficult to pinpoint the issue with just the above info. What do you see in the python.log?
$SPLUNK_HOME/var/log/splunk/python.log
Is any email going out of your splunk server (for other alerts)?

[perlish]

Hi, Yasaswy .thanks for you answer my question ~.

any email going out of your splunk server (for other alerts)?
not anyone email success to send . and i'm sure the sender account&password is right

python.log with two error line :

2016-03-03 10:39:04,434 +0800 ERROR sendemail:114 - Sending email. subject="Splunk Alert: 危险端口开启告警 high port scan", results_link="http://linuxscan:8000/app/asset_discovery/@go?sid=scheduler__admin_YXNzZXRfZGlzY292ZXJ5__RMD51f09c7f374d6ba97_at_1456972740_1332", recipients="[u'test@test.com']", server="smtp.exmail.test.com:465"
2016-03-03 10:39:04,434 +0800 ERROR sendemail:377 - 'NoneType' object has no attribute 'find' while sending mail to: test@test.com