avgemca.exe is a program which is most likely legit. So, if avgemca.exe is on your system, it is most likely ok, and will NOT be a cause for concern. Even if your system is virus-free, it is still recommended to purchase a well-known antivirus with a good track record, in order to yourself yourself against threats.
Normally, this program is found in C:\Program Files (x86)\AVG\AVG2015\avgemca.exe.
The MD5 checksum for this executable is 30ada58497c96a14c7665f2dc22f9488.
This program is NOT a Windows service. This is good.
64-bit code has been detected. This exe can use the full power of a modern PC processor.
The description stored in the file is AVG E-mail Scanner.
File version stored as a property 18.104.22.16801.
Maker AVG Technologies CZ, s.r.o..
Copyright notice Copyright (C) 2016 AVG Technologies CZ, s.r.o..
avgemca.exe is digitally signed. Nowadays most serious programs are digitally signed.
The digital signature attached to avgemca.exe is valid. This is excellent.
Digital certificate name: AVG Technologies CZ, s.r.o.
Certificate's issuer name: VeriSign Class 3 Code Signing 2010 CA
It has an uninstall routine, which is a good sign. si are uninstall.