What are the two parts of E-mail address ?

Q: 58 (MPPSC/2013)

question_subject:

Polity

question_exam:

MPPSC

stats:

0,10,5,5,0,0,10

keywords:

{'home address': [0, 0, 0, 1], 'domain name': [0, 0, 1, 0], 'user name': [0, 0, 0, 1], 'parts': [6, 2, 8, 19], 'password': [0, 0, 0, 1], 'signature': [0, 0, 0, 1], 'legal name': [0, 0, 0, 1]}