# E-mail links unique key
**URL:** https://forum.mautic.org/t/e-mail-links-unique-key/2999
**Category:** Product Support
**Created:** [December 17, 2015, 10:02am UTC](https://forum.mautic.org/t/e-mail-links-unique-key/2999 "2015-12-17T10:02:54Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@pietromantovani](https://forum.mautic.org/u/pietromantovani)
#### Post date: [December 17, 2015, 10:02am UTC](https://forum.mautic.org/t/e-mail-links-unique-key/2999/1 "2015-12-17T10:02:54Z")
Hello,
Documentation tells that “Mautic replaces all links in the email with links back to Mautic with a unique key”. Does anybody know the name of the files involved in this process? I’m trying to understand why, in my case, Mautic create this URL for just one e-mail per sending.
Many thanks,
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### Author:  [@pietromantovani](https://forum.mautic.org/u/pietromantovani)
#### Post date: [December 17, 2015, 10:02am UTC](https://forum.mautic.org/t/e-mail-links-unique-key/2999/2 "2015-12-17T10:02:54Z")
Hello,
Documentation tells that “Mautic replaces all links in the email with links back to Mautic with a unique key”. Does anybody know the name of the files involved in this process? I’m trying to understand why, in my case, Mautic create this URL for just one e-mail per sending.
Many thanks,
---
### Author:  [@silavapi](https://forum.mautic.org/u/silavapi)
#### Post date: [February 2, 2020, 10:56pm UTC](https://forum.mautic.org/t/e-mail-links-unique-key/2999/3 "2020-02-02T22:56:33Z")