Email inbound process is done by user SAPCONNECT so that you cannot debug it via normal debugging approach.
then you have to follow the steps below to debug:
(1) Inside one entry like below into table BCSD_BREAKLOOP.
BL Module = INBOUND
CREATEDFOR = SAPCONNECT
Set the expire time accordingly.
Note: As the insertion of this entry will lead to an endless loop in SAPconnect inbound processing, please make sure to delete it or set the status to abap_false.
(2) Send your mail to agent inbox mail box as usual, then go to tcode SM51, you should find the endless loop there.
Click Administration->Programm->Debugging:
This is because your entry inserted by step1 takes effect:
(3) In debugger, use Shift+F12 to jump out of the endless loop manually:
After that you could debug the left inbound process of SAP connect now:
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