You can use Python Reg Expression Module "Re"
import re
print(re.search(r"[0-9a-zA-Z.]+@[a-zA-Z]+\.(com|co\.in)$","ram.sharma@programsbuzz.com"))
print(re.search(r"[0-9a-zA-Z.]+@[a-zA-Z]+\.(com|co\.in)$","ram.sharmaprogramsbuzz.com"))
print(re.search(r"[0-9a-zA-Z.]+@[a-zA-Z]+\.(com|co\.in)$","ram.sharma@programsbuzzcom"))
print(re.search(r"[0-9a-zA-Z.]+@[a-zA-Z]+\.(com|co\.in)$","ram.sharma@programsbuzz.co.in"))
Output
<re.Match object; span=(0, 27), match='ram.sharma@programsbuzz.com'>
None
None
<re.Match object; span=(0, 29), match='ram.sharma@programsbuzz.co.in'>