How to check there came a letter in mail()?

You need to collect statistics about the emails that came and that never came. How to do it?
March 12th 20 at 08:42
2 answers
March 12th 20 at 08:44
an invisible pixel is necessary to build
Not viewed and reached. If you meant it, then what kind of pixel? How does it work? - Henry_Hand72 commented on March 12th 20 at 08:47
pixel script metrics - Loren.Nienow commented on March 12th 20 at 08:50
March 12th 20 at 08:46
How to get delivery report emails php?

there the answer see the word "log"

when it came does not guarantee the existence of the drawer, and therefore the pixels
But if I again ask this question, not finding a solid answer, what answer you will throw a link? - Henry_Hand72 commented on March 12th 20 at 08:49
isn't it obvious? - Vernie.Block commented on March 12th 20 at 08:52

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