engisheseposte.dll is a SHESEPOSTE
belonging to Trust@Fast - Shell Extension Sign Encrypt
from Engiweb Security
Non-system processes like engisheseposte.dll originate from software you installed on your system. Since most applications store data in your system's registry, it is likely that your registry has suffered fragmentation and accumulated invalid entries which can affect your PC's performance. It is recommended that you check your registry to identify slowdown issues.