Unable to send email output of report through SYSADMIN user

I am using EBS 12.1.3 with DB  12.1.0.2.0 I have a scheduled report which generates excel output and sends it to some recipients via email. But this report always completes in warning when ran by SYSADMIN. OPP log file mentions below error however other users are able to send output via email.

[4/19/21 8:03:05 PM] [OPPServiceThread0] Post-processing request 86836255.

[4/19/21 8:03:05 PM] [269433:RT86836255] Executing post-processing actions for request 86836255.

[4/19/21 8:03:05 PM] [269433:RT86836255] Starting XML Publisher post-processing action.

[4/19/21 8:03:05 PM] [269433:RT86836255] 

Template code: XRCLTMSDELIVERYORDEXC

Template app: XRCL

Language:   EN

Territory:   US

Output type:  EXCEL

[4/19/21 8:03:08 PM] [269433:RT86836255] XML Publisher post-processing action complete.

[4/19/21 8:03:08 PM] [269433:RT86836255] CONC-OPP-DELIV BEGIN (REQID=86836255)

[4/19/21 8:03:08 PM] [269433:RT86836255] Beginning email delivery