app-MAIL-temp/app/email_validation.py

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from email_validator import (
validate_email,
EmailNotValidError,
)
from app.utils import convert_to_id
# allow also + and @ that are present in a reply address
_ALLOWED_CHARS = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_-.+@"
def is_valid_email(email_address: str) -> bool:
"""
Used to check whether an email address is valid
NOT run MX check.
NOT allow unicode.
"""
try:
validate_email(email_address, check_deliverability=False, allow_smtputf8=False)
return True
except EmailNotValidError:
return False
def normalize_reply_email(reply_email: str) -> str:
"""Handle the case where reply email contains *strange* char that was wrongly generated in the past"""
if not reply_email.isascii():
reply_email = convert_to_id(reply_email)
ret = []
# drop all control characters like shift, separator, etc
for c in reply_email:
if c not in _ALLOWED_CHARS:
ret.append("_")
else:
ret.append(c)
return "".join(ret)