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berkerpeksag/duplicate_to.py

Last active June 12, 2016 07:52
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duplicate_to.py
import email
import email.policy
from email.mime.multipart import MIMEMultipart
m = email.message_from_string('', policy=email.policy.default)
m['To'] = 'a@b.com'
m['To'] = 'a@b.com' # will raise ValueError
# and here is an alternative way
m = MIMEMultipart()
m.policy = email.policy.default
m['To'] = 'a@b.com'
m['To'] = 'a@b.com' # will raise ValueError
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