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I have written a php e-mail processing client that uses the IMAP protocol.
I noticed that it processes auto responders like normal e-mails which is undesirable. Is there something in the mail header that would indicate that the e-mail is not from a human but from an auto/vacation responder?
Any help would be appreciated.
There is no 100% reliable way to do this. However, automated messages should have an empty (
<>) Envelope-From header (that’s the RFC821 “MAIL FROM” header, not the RFC822 “From:” header).How you determine what the Envelope-From header is from the messages you retrieve via IMAP will depend on your mail server implementation.