Test emails and task mails are sent out by different processes, hence extra settings on SMTP server side may be necessary.
Verify that the Mail Server is correctly configured in the QlikView Management Console.
If the Mail Server was set up after the tasks were set up, recreate the task. The eMail server information will otherwise not be sent to the task.
If step 2 cannot fix the problem, the cause is likely on SMTP server side rather than QlikView side. Please involve the SMTP server admin and explain the following points:
Test mails are sent out by QlikView Management Service(QMS), or QVManagementService.exe
Task mails are sent out by QlikView Distribution Service(QDS), or QVDistributionService.exe
SMTP server may be allowing QMS to send email but disallowing QDS -- needs to be configured by SMTP server admin
QMS and QDS may be running on different servers, which have different permissions to send emails -- needs to be configured by SMTP server admin
QMS and QDS may be running under different accounts, which have different permissions to send emails -- needs to be configured by SMTP server admin
Change the QVManagementService.exe.config that is located at C:\Program Files\QlikView\Management Service. You will need to change <add key="UseSSLForSMTP" value="false"/> from false to true.
change the QVDistributionService.exe.config that is located at C:\Program Files\QlikView\Distribution Service. You will need to change <add key="UseSSLForSMTP" value="false"/> from false to true.