import re
text = """Recipient:
nolo.lamb@golab.com \--- mail_boundary --- ATTENTION: This email came from an
external source.
Sender: nlrt@vloh.net Subject: [External] *LEGALZOOM OPENS AT $30, IPO
AT $28 Message-Id: <60DC94E60001AE8432F70080_0_2129298@mscv03>
Recipient: Nichole.wen@golab.com \--- mail_boundary --- """
print( re.findall(r'\bRecipient:\s*(\S+@\S+)', text) )
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