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However, the files are NOT intended for use as a permanently managed customer installation, as they will be overwritten during a scenario update. They may be adopted or replaced with your own compatible implementation.
Copy the template files before making any changes and edit only the production copy. Use a different file name or a separate folder for the production installation, for example:
Online-Buchung/mailer/customer-mailer.php
Online-Buchung/mailer/customer-mailer.php
Alternatively, you can use a fully customised, compatible email client solution. In particular, a custom implementation must: