FAX Delivery receipts stopped sending

on server 2012 essentials windows fax , scan service.  all has been working fine months fax.  however, of 3 days ago, delivery notification receipts stopped showing users.  it critical office have delivery receipts prove faxes sent, things have come grinding halt.  the settings still in microsoft fax service manager send receipts smtp server , login credentials.  these settings have remained same months , have found nothing changed concurrent problem starting.  we have rebooted server.  i've checked event logs, i've stopped , restarted services.  i can't find cause receipts stop working.  the server using smtp server sending receipts.  any ideas out there me?

hi,

it seems parameter not typed correctly in box on receipts tab of fax properties dialog box.

you follow steps verify setting again below:

in left pane of fax service manager, right-click fax, , click properties. on receipts tab, verify information correct.

please see more details link below:

configure fax delivery receipts https://technet.microsoft.com/en-us/library/cc732281.aspx?f=255&mspperror=-2147217396

besides, have checked if changed on firewall settings? sometimes, may caused firewall block.

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Windows Server  >  Print/Fax