“The domain/default pair of (, UserHeaders) does not exist.” When you enter the “defaults read UserHeaders” command, you may occasionally encounter the following error:
Press the “Enter” key on your keyboard.Įrror: The domain/default pair doesn’t exist. Copy/paste the following into the Terminal:. Navigate to “Applications > Utilities.”. The Mail application doesn’t support read receipts by default, but you can enable this feature using your Mac’s Terminal: Listen to your emails with Checker Plus for Gmail Receipts are notifications that are sent when an email is opened, so it doesn’t guarantee that your message has been read, understood, or whether the recipient is ever going to reply – but at least you’ll know that your email has been received safely, and that someone is monitoring this particular inbox!Īpple’s Mail application doesn’t support read receipts out-of-the-box, but in this article I’ll be sharing a few Terminal commands that you can use to add this important piece of functionality to your Mail application. If you’re sick of wondering whether your email has even been opened, then you can use Apple’s Mail application to request read receipts. There’s plenty of reasons why your unopened email might hang around in the recipient’s inbox for a while – maybe they’re out of office perhaps they’re travelling and don’t have access to the Internet, or maybe they’ve left the company and no-one is monitoring their inbox. Please note that many email servers do not support DSN and will not return a notification of delivery status.When you send an email, you can usually be confident that your message will be delivered quickly and without any issues – but how do you know whether the recipient has actually opened your message? From a compose window go to Options > Delivery Status Notification to add a DSN request to the outgoing message. Postbox also supports Delivery Status Notifications (or DSN). Note that it is up to the receiver to determine whether or not they wish to return the receipt. Once this is configured, you can request a return receipt for a specific message you are sending by going to Options > Return Receipt from the Compose Window. Windows: Tools > Options > Accounts > > Return Receipts Mac: Preferences > Accounts > > Return Receipts Or you can customize the behavior for handling return receipts on a per-account basis by going to: 
Windows: Tools > Options > Advanced > General > Return Receipts Mac: Preferences > Advanced > General > Return Receipts
You can enable and customize behavior for return receipts for all accounts by going to:
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