1. In order to monitor abnormal emails at any time, in addition to using SMS, I also set up an email to automatically send a bounce message to my mailbox:
(1) SMS settings:
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(2) email return settings:
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(3) An abnormal email is monitored, but what is the problem cannot be seen using outlook? (Only the mail header can be seen, the sender ?)
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(4) use Foxmail to open the email. You can clearly see who the sender is?
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(5) check whether the sender is a disabled internal account and has been used to send spam? To be checked, but the temporary solution is to block the account and restrict it to the global Sender:
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Automatic spam handling by internal accounts