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sasnaktivFlag for United States of America

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In PHP mail, how can I track which mail is opened and which is deleted?

Hi Guys,
My PHP mail functions just fine when sending out numerous messages. How can I determine if mail is opened or deleted?
I'd appreciate the help,
Sas
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COBOLdinosaur
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Thanks Guys,
Yes I'm familiar with the clickable link & I'm using it, but it only tells me if the recipient clicks on it. My personal Thunderbird email client actually tells me if a message was read or deleted without any links in the messages. So apparently, there is another way. How do they do it?
Sas
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They have to have notifications set on on their side - this is optional and can be switched off so it is no guarantee.

There are obviously privacy issues here which need to be addressed - you cannot force an acknowlegement of a mail read / received.

Think of it a courtesy the recipient extends to you - not a right you have.
How do they do it?
Maybe they just look like they are doing it.  Email is a complicated mess, without any accountability for the communications.  Microsoft has built some tools into Outlook - things like "read receipts" and the like, but for the most part, unless you control the email reader programs that your recipients are using, you do not control enough to get a dependable indicator of who read, who deleted, who ignored, etc.  What you can know is whether the tracking pixel script was activated.  Your "read rate" is almost certainly at least that high.
Thanks for all the help.