A more thorough explanation:

Declaration of mailing is a legal document that proves that the required court materials have been sent to the correct recipient. This document is necessary for various legal documents, such as serving someone by mail. It ensures that the sender has taken the necessary steps to inform the other party of a lawsuit or other important information. The document also provides proof of mailing, even if the other party denies receiving the document.

The declaration of mailing is usually signed under penalty of perjury to ensure its validity. This means that if the sender lies on the document, they can be charged with perjury, which is a serious crime.

For example, if someone is suing another person, they may need to serve them with a copy of the lawsuit. If the person cannot be served in person, the lawsuit can be sent by mail. The sender would then file a declaration of mailing to prove that they sent the lawsuit to the correct address.

Another example is if a landlord needs to give notice to a tenant to vacate the property. If the tenant cannot be reached in person, the notice can be sent by mail. The landlord would then file a declaration of mailing to prove that they sent the notice to the correct address.

These examples illustrate how the declaration of mailing is used to provide proof that legal documents have been sent to the correct recipient. It is an essential document in the legal system that ensures fairness and transparency.