How can I search for a message in all public emails?

Yesterday a site sent a message (of which I know the subject) to a temporary mailbox on mailsac, but I lost the temporary address and I would need to get that email. Is It possible?

Thanks in advance

Hi Leo, sorry this is not possible via the API, without knowing the inbox.

Due to relatively fast message recycling (or if it was private and your account storage is full) it may already be gone.

If it is a message on a private address, it may show up in your unified inbox:

Please contact, include your account username, and all possible information about the message (subject, from/to names, time), we may be able to find it if it is critical.