But is it not that the whole thread has same id? I was trying to send myself a text message everytime I get a certain status email. Problem was that all emails had same subject. I was using Google Apps Script. I ended up marking each email processed's arrival date & time when processed; & later skip all whose date time already exists in sheet.
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There's the Message-ID field, but do e-mail clients (apart from Mutt) let you search for the message with a given Message-ID?
E.g. GMail supports rfc822msgid:<id> searches.
But is it not that the whole thread has same id? I was trying to send myself a text message everytime I get a certain status email. Problem was that all emails had same subject. I was using Google Apps Script. I ended up marking each email processed's arrival date & time when processed; & later skip all whose date time already exists in sheet.