Print destination extensions allow you to set up custom output actions which will be applied additionally to the main print destination the report is printed to. Print destination extensions are applied in the order according to the Sequence field until the record with the activated checkbox Stop search is found. You can add your print destination extensions on a global level applying it for all printed Reports/Entities as well as you can do the setup per each Report/Entity.
Report/Entity print destination extensions are applied first, followed by global level print destination extensions.
For example, you set up for your report Print destination extension with SaveAction. That means when choosing the report print destination Printer, the report will be sent to a printer and additionally saved to the folder and signed. Moreover, saving to the folder will be performed before or after sending to a printer depending on whether this print destination extension is opening or closing.
Setup on global Report/Entity level

Setup on global Report/Entity level
The opening print destination extensions will be executed before the main print destination (the report is run with). The closing print destination extensions – after the main print destination.
To limit the use of the print destination extension, select the Has conditions checkbox and set up the main print destinations applicable for this print destination extension:

Print destination extensions with conditions
If you send your dox42 report per email via D365 FSCM, email body may also be generated by dox42 server as well as the report file itself. The Apply when sending emails via D365 parameter provides you with the advanced control on how print destinations should be applied in such scenarios:
Report only – a print destination extension is applied to the dox42 report file generation thread only (by default).
Email body only – a print destination extension is applied to the dox42 email body generation thread only.
Both – a print destination extension is always applied.
Setup per Report/Entity

Print destination extensions setup per SSRS report

Print destination extensions setup per Electronic reporting report

Print destination extensions setup per Entity