def handle_bounce(contact: Contact, alias: Alias, msg: Message, user: User):
address = alias.email
email_log: EmailLog = EmailLog.create(contact_id=contact.id,
bounced=True,
user_id=contact.user_id)
db.session.commit()
nb_bounced = EmailLog.filter_by(contact_id=contact.id,
bounced=True).count()
disable_alias_link = f"{URL}/dashboard/unsubscribe/{alias.id}"
# <<< Store the bounced email >>>
# generate a name for the email
random_name = str(uuid.uuid4())
full_report_path = f"refused-emails/full-{random_name}.eml"
s3.upload_email_from_bytesio(full_report_path, BytesIO(msg.as_bytes()),
random_name)
orig_msg = get_orig_message_from_bounce(msg)
if not orig_msg:
LOG.error(
"Cannot parse original message from bounce message %s %s %s %s",
alias,
user,
contact,
full_report_path,
)
return
file_path = f"refused-emails/{random_name}.eml"
s3.upload_email_from_bytesio(file_path, BytesIO(orig_msg.as_bytes()),
random_name)
# <<< END Store the bounced email >>>
mailbox_id = int(orig_msg[_MAILBOX_ID_HEADER])
mailbox = Mailbox.get(mailbox_id)
if not mailbox or mailbox.user_id != user.id:
LOG.error(
"Tampered message mailbox_id %s, %s, %s, %s %s",
mailbox_id,
user,
alias,
contact,
full_report_path,
)
return
refused_email = RefusedEmail.create(path=file_path,
full_report_path=full_report_path,
user_id=user.id)
db.session.flush()
email_log.refused_email_id = refused_email.id
email_log.bounced_mailbox_id = mailbox.id
db.session.commit()
LOG.d("Create refused email %s", refused_email)
refused_email_url = (URL + f"/dashboard/refused_email?highlight_id=" +
str(email_log.id))
# inform user if this is the first bounced email
if nb_bounced == 1:
LOG.d(
"Inform user %s about bounced email sent by %s to alias %s",
user,
contact.website_email,
address,
)
send_email_with_rate_control(
user,
ALERT_BOUNCE_EMAIL,
# use user mail here as only user is authenticated to see the refused email
user.email,
f"Email from {contact.website_email} to {address} cannot be delivered to your inbox",
render(
"transactional/bounced-email.txt",
name=user.name,
alias=alias,
website_email=contact.website_email,
disable_alias_link=disable_alias_link,
refused_email_url=refused_email_url,
mailbox_email=mailbox.email,
),
render(
"transactional/bounced-email.html",
name=user.name,
alias=alias,
website_email=contact.website_email,
disable_alias_link=disable_alias_link,
refused_email_url=refused_email_url,
mailbox_email=mailbox.email,
),
# cannot include bounce email as it can contain spammy text
# bounced_email=msg,
)
# disable the alias the second time email is bounced
elif nb_bounced >= 2:
LOG.d(
"Bounce happens again with alias %s from %s. Disable alias now ",
address,
contact.website_email,
)
alias.enabled = False
db.session.commit()
send_email_with_rate_control(
user,
ALERT_BOUNCE_EMAIL,
# use user mail here as only user is authenticated to see the refused email
user.email,
f"Alias {address} has been disabled due to second undelivered email from {contact.website_email}",
render(
"transactional/automatic-disable-alias.txt",
name=user.name,
alias=alias,
website_email=contact.website_email,
refused_email_url=refused_email_url,
mailbox_email=mailbox.email,
),
render(
"transactional/automatic-disable-alias.html",
name=user.name,
alias=alias,
website_email=contact.website_email,
refused_email_url=refused_email_url,
mailbox_email=mailbox.email,
),
# cannot include bounce email as it can contain spammy text
# bounced_email=msg,
)
def handle_bounce(contact: Contact, alias: Alias, msg: Message, user: User):
disable_alias_link = f"{URL}/dashboard/unsubscribe/{alias.id}"
# Store the bounced email
# generate a name for the email
random_name = str(uuid.uuid4())
full_report_path = f"refused-emails/full-{random_name}.eml"
s3.upload_email_from_bytesio(full_report_path, BytesIO(msg.as_bytes()),
random_name)
file_path = None
mailbox = None
email_log: EmailLog = None
orig_msg = get_orig_message_from_bounce(msg)
if not orig_msg:
# Some MTA does not return the original message in bounce message
# nothing we can do here
LOG.warning(
"Cannot parse original message from bounce message %s %s %s %s",
alias,
user,
contact,
full_report_path,
)
else:
file_path = f"refused-emails/{random_name}.eml"
s3.upload_email_from_bytesio(file_path, BytesIO(orig_msg.as_bytes()),
random_name)
try:
mailbox_id = int(orig_msg[_MAILBOX_ID_HEADER])
except TypeError:
LOG.exception(
"cannot parse mailbox from original message header %s",
orig_msg[_MAILBOX_ID_HEADER],
)
else:
mailbox = Mailbox.get(mailbox_id)
if not mailbox or mailbox.user_id != user.id:
LOG.exception(
"Tampered message mailbox_id %s, %s, %s, %s %s",
mailbox_id,
user,
alias,
contact,
full_report_path,
)
# cannot use this tampered mailbox, reset it
mailbox = None
# try to get the original email_log
try:
email_log_id = int(orig_msg[_EMAIL_LOG_ID_HEADER])
except TypeError:
LOG.exception(
"cannot parse email log from original message header %s",
orig_msg[_EMAIL_LOG_ID_HEADER],
)
else:
email_log = EmailLog.get(email_log_id)
refused_email = RefusedEmail.create(path=file_path,
full_report_path=full_report_path,
user_id=user.id)
db.session.flush()
LOG.d("Create refused email %s", refused_email)
if not mailbox:
LOG.debug("Try to get mailbox from bounce report")
try:
mailbox_id = int(get_header_from_bounce(msg, _MAILBOX_ID_HEADER))
except Exception:
LOG.exception("cannot get mailbox-id from bounce report, %s",
refused_email)
else:
mailbox = Mailbox.get(mailbox_id)
if not mailbox or mailbox.user_id != user.id:
LOG.exception(
"Tampered message mailbox_id %s, %s, %s, %s %s",
mailbox_id,
user,
alias,
contact,
full_report_path,
)
mailbox = None
if not email_log:
LOG.d("Try to get email log from bounce report")
try:
email_log_id = int(
get_header_from_bounce(msg, _EMAIL_LOG_ID_HEADER))
except Exception:
LOG.exception("cannot get email log id from bounce report, %s",
refused_email)
else:
email_log = EmailLog.get(email_log_id)
# use the default mailbox as the last option
if not mailbox:
LOG.warning("Use %s default mailbox %s", alias, refused_email)
mailbox = alias.mailbox
# create a new email log as the last option
if not email_log:
LOG.warning("cannot get the original email_log, create a new one")
email_log: EmailLog = EmailLog.create(contact_id=contact.id,
user_id=contact.user_id)
email_log.bounced = True
email_log.refused_email_id = refused_email.id
email_log.bounced_mailbox_id = mailbox.id
db.session.commit()
refused_email_url = (URL + f"/dashboard/refused_email?highlight_id=" +
str(email_log.id))
nb_bounced = EmailLog.filter_by(contact_id=contact.id,
bounced=True).count()
if nb_bounced >= 2 and alias.cannot_be_disabled:
LOG.warning("%s cannot be disabled", alias)
# inform user if this is the first bounced email
if nb_bounced == 1 or (nb_bounced >= 2 and alias.cannot_be_disabled):
LOG.d(
"Inform user %s about bounced email sent by %s to alias %s",
user,
contact.website_email,
alias,
)
send_email_with_rate_control(
user,
ALERT_BOUNCE_EMAIL,
user.email,
f"Email from {contact.website_email} to {alias.email} cannot be delivered to your inbox",
render(
"transactional/bounced-email.txt",
name=user.name,
alias=alias,
website_email=contact.website_email,
disable_alias_link=disable_alias_link,
refused_email_url=refused_email_url,
mailbox_email=mailbox.email,
),
render(
"transactional/bounced-email.html",
name=user.name,
alias=alias,
website_email=contact.website_email,
disable_alias_link=disable_alias_link,
refused_email_url=refused_email_url,
mailbox_email=mailbox.email,
),
)
# disable the alias the second time email is bounced
elif nb_bounced >= 2:
LOG.d(
"Bounce happens again with alias %s from %s. Disable alias now ",
alias,
contact.website_email,
)
alias.enabled = False
db.session.commit()
send_email_with_rate_control(
user,
ALERT_BOUNCE_EMAIL,
user.email,
f"Alias {alias.email} has been disabled due to second undelivered email from {contact.website_email}",
render(
"transactional/automatic-disable-alias.txt",
name=user.name,
alias=alias,
website_email=contact.website_email,
refused_email_url=refused_email_url,
mailbox_email=mailbox.email,
),
render(
"transactional/automatic-disable-alias.html",
name=user.name,
alias=alias,
website_email=contact.website_email,
refused_email_url=refused_email_url,
mailbox_email=mailbox.email,
),
)
