Will this sender write again
The search for an anonymous inbox usually starts on a form that demands an address before it will continue. The site wants a string that can receive one message. If you are not sure the sender will write again, keep your daily address off that form. The VoidFwd home page hands you an address with no account. It lasts three hours, can be extended, and cannot pass twenty-four hours from the moment it was created. Codes, download checks, and one-time notices belong there. The address cannot send mail, and attachments are not kept. A message over one hundred megabytes is refused.
A one-time code can use the home-page address. Orders, digests, and password resets belong on an alias.
What a three-hour address is for
The motion is three steps. Wait for the address on the home page and copy it, do not retype it. Paste it into the other site. Come back and watch the list. A code usually arrives within a minute or two. If the clock has already hit zero, take a new address and ask for another send. Replacing the address creates a new box and destroys the old one, so the clock returns to about three hours. If that site will keep writing, switch to anonymous forwarding instead of leaving the short address on the account.
Replace the address only after you have copied what you need. The old box is destroyed, and any unread code goes with it.
When a short address is the wrong tool
A bank, a government form, a work account, or any service that sends password resets to this address should not get a three-hour inbox. When the address expires, the code has nowhere to land and the account is locked outside. Use a forwarding alias, or your own inbox.
After the short address expires, a resend on the login page has nowhere to land. An alias stays on your real inbox, with thirty days still kept here.
Read it and let it go
Once you have copied the code, the letter does not need to stay. Delete that one message, or replace the address and destroy the old box with it. Do not forward the page link that carries the mailbox token. If the site will write again, open anonymous forwarding instead of leaving the short address on the account.
Deleting one message clears that letter. Replacing the address clears the whole box. Neither leaves the token link on a public page.