How can we track the opening of emails without services?

How can we track the opening of emails?
Sending via SMTP is stupid.
I imagine it something like this:
Some link listed, then there is call divert.
As it is correctly implemented, and whether it is possible?
July 8th 19 at 16:47
5 answers
July 8th 19 at 16:49
Usually just implemented an external picture, which is unique for every letter of the url. Will work if the email client / service opens external images.
Well, actually, I would like to not only open and click-through. If you can certainly. - caleb_Stehr commented on July 8th 19 at 16:52
: so add in links to unique setting - Robb45 commented on July 8th 19 at 16:55
: Forgot to mention most importantly) Links to some are on Facebook, and it is impossible to trace the source UTM on the label) and That's why I gentle sledili) - caleb_Stehr commented on July 8th 19 at 16:58
Well redirectto them through. - Robb45 commented on July 8th 19 at 17:01
July 8th 19 at 16:51
The opening of the letters (namely the opening):
1) the Field "Disposition-Notification-To" in the headers is precarious, guarantee that you will receive notification no
2) the Picture in the message src is controlled by the server a unique address-type src="" - as unreliable, the reader is likely to immediately pictures will not show

Opening links:
Links through a redirect or some such public service.
But, opening the link I need actually. Opening emails is not so important actually. - caleb_Stehr commented on July 8th 19 at 16:54
Disposition-Notification-To this DSN. Standard read receipts, there is a non-standard X-Confirm-Reading-To, which is supported by some applications/mail services, but usually it requires user verification, so to use it in the newsletter not worth it. - Robb45 commented on July 8th 19 at 16:57
: You are right. - caleb_Stehr commented on July 8th 19 at 17:00
July 8th 19 at 16:53
There is no universal solution, in a nutshell.
If the client does not automatically loads the images (often disconnected), and did not include an automatic read receipt (it's almost always the manual upon request), it is nothing you without his voluntary actions are not traceable.
July 8th 19 at 16:55
The question appears with an enviable regularity:
How to check the opening of letters sent via mail()?
Briefly again, insert graphics with a unique token and check for circulation on it.
If you want to track the clicks - insert redirects with unique tokens.
July 8th 19 at 16:57
Can. But not to be trusted. Because anyone connect to the controlled client. Yes, tea, especially reading otluca, honestly sends a message that read, honest open an embedded link. While others easily ignore. TB for example, by default, blocks all pictures in email or send answers to the queries "request a read receipt". Well, in the corporate e-mail in General can do anything - even to cutting the links with the delivery of letters, as does Lotus Notes.

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