Emailing documents from some devices is the only way to "print" from them, but the sender's email address (over which the user has no control) may contain characters that Internet standards consider valid but the HP ePrint page rejects as "invalid".
On your ePrint page, https://www.hpsmart.com/us/en/myprinter/, the "Allowed" ePrint access form does not accept certain valid email addresses, so this feature cannot be used with some devices unless access is set to "Open to Anyone".
A specific example is the reMarkable tablet for which emailing a document is the only way to print directly from the device. The email it sends with the document as an attachment has the following lines:
On the ePrint "Allowed" list, adding "email@example.com" does not allow printing from this device. It is not possible to add "firstname.lastname@example.org", because the ePrint page rejects that address with "Please enter a valid email address."
Sure, it's a Color LaserJet Pro M252dw, however, the problem almost certainly has nothing to do with the printer itself. It is the ePrint web page that is rejecting valid email addresses. It won't allow me to enter such addresses into the list of allowed emails.
From the Home screen on the product control panel, touch the Connection Information button. 2. Open the following menus: ● ePrint ● Settings 3. Touch the disbale Web Services button and then enable webservices and then check.
Be alert for scammers posting fake support phone numbers and/or email addresses on the community. If you think you have received a fake HP Support message, please report it to us by clicking on "Flag Post".