Measure openings

An invisible 1x1 pixel image is placed based on the code:

<img width="1" height="1" alt="" src="">


How is the URL composed?

Logxxxx: subdomain in charge of redirecting and the measurement of clicks (xxxx to be replaced by what you are given in your account).

hit.xiti: name of the 'image' object composing the hit (1x1 transparent pixel)

s: the s variable contains your site ID (xtsite of the tagging code).

xto: the xto variable should contain at least one prefix indicating the type of campaign, as well as a campaign ID.


Structure of xto variables

The folloing are the various parameters of the xto variable to be filled out (with nomenclature as follows: xto=A-B-C-D-E-F).


A (source): prefix EREC, EPR or ES

B: campaign ID value

C: Email ID in the format [label] or id[label]



D: Email date in short format: YYYYMMDD

E: leave empty ([])

F: contacts list with contact ID according to id@list (for example 1435@1 for contact 1435 of list 1).

Example: <img width="1" height="1" alt="" src=" s=102&xto=EPR-300-[Presentation_service]-20070304-[]-3039@20&type=email&">


  • The email label/name (C, between brackets) must be filled out in the same way as page names: without special characters (accents, spaces or others).
  • If [xxxxx] and id[xxxxx] are found, we’ll consider that these are 2 different elements (even if the label is identical).
  • * If we find the same ID with 2 different labels (for example 23[creative] and 23[creatives]), only the 1st label will be saved and associated with the ID.
  • The absence of 'type=email’ will result in the measurement of a click (source) and not an email opening.

You must insert this tag in the email’s HTML code between the <body> and </body> tags.

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