What is proof of service, and can you do it by mail?
By Justin Winter · Updated August 22, 2026
Proof of service shows that you notified a specific party in a legal proceeding — a lawsuit, an eviction, a legal notice — the way the applicable rule requires, which is a narrower and stricter bar than ordinary proof of mailing. When a court rule, statute, or lease permits service by mail, Certified Mail with electronic Return Receipt ($14.99) is the paperplane product people reach for, because it documents the date mailed and the date and signer of delivery. It does not, by itself, complete a legally sufficient proof-of-service filing in every jurisdiction — you still need to confirm the rule and attach the mailing evidence to whatever affidavit or form that rule requires.
People often use "proof of mailing" and "proof of service" interchangeably, but in a legal proceeding they are not the same thing. Proof of mailing just documents that you sent something. Proof of service documents that you gave legally sufficient notice to a specific party in a specific case — and what counts as sufficient is set by the court rule, statute, or lease that governs that proceeding, not by the mail carrier. Get this distinction wrong and a filing can be rejected, a default judgment can be vacated, or a deadline can be missed entirely.
Why proof of service is stricter than proof of mailing
A typical proof-of-service rule asks for more than a mailing date. Depending on the jurisdiction and the type of case, it may specify: who is allowed to serve the document (sometimes it cannot be the party themselves), whether mail is an acceptable method at all, what class of mail qualifies, whether a signature on delivery is required, and what form the proof itself must take — often a signed affidavit of service filed with the court, not just a receipt. Some proceedings (many lawsuits at the outset, for example) require personal service and do not accept mail as a substitute; others (many post-judgment notices, some eviction steps, many HOA and lien notices) explicitly permit Certified Mail. You have to check the rule for your case type and jurisdiction — there is no universal answer.
Where Certified Mail with electronic Return Receipt fits in
When a rule does allow service by mail, Certified Mail with electronic Return Receipt ($14.99) is the paperplane product built for it, because it produces the two pieces of evidence most such rules ask for: a USPS-recorded date of mailing, and a separate document showing the delivery date and the recipient's signature. Certified Mail alone ($12.99) gives you the mailing date and tracking but not a standalone signed delivery record — enough for some rules, not enough for others. Neither product is, by itself, the "proof of service" document your court wants; both simply produce the underlying mailing and delivery evidence that you then attach to whatever affidavit or certificate-of-service form your jurisdiction requires.
| Service | Price | Evidence it produces |
|---|---|---|
| First-Class | $1.99 | Basic send confirmation only — no USPS-recorded proof, not suited to service of process. |
| Certified Mail | $12.99 | USPS-dated mailing record plus tracking to delivery. |
| Certified + electronic Return Receipt | $14.99 | Mailing record, plus a standalone document with delivery date and recipient signature. |
| Priority | $24.99 | Faster transit (1–3 days); add Certified for a formal mailing record. |
Before you rely on mail for service
- Read the actual rule — your court's local rules, your state's rules of civil procedure, the statute governing the notice, or the lease/HOA covenant — before assuming mail is allowed.
- Confirm who is permitted to be "the server." Some rules bar the party themselves from serving their own documents, even by mail.
- Check whether a specific proof-of-service or affidavit-of-service form is required, separate from any mail receipt.
- If the stakes are high — a lawsuit, an eviction, anything with a hard deadline — ask an attorney rather than relying on general guidance like this page.
This page is general information about how paperplane's mail products work, not legal advice. It does not tell you whether mail service is permitted for your case, what form of proof your court requires, or whether paperplane's receipt alone satisfies that requirement — those depend on rules that vary by jurisdiction and case type, and only you (or your attorney) can confirm them for your matter.
Related: what counts as proof of mailing, legal mailing services, or what Certified Mail is.
Common questions
Is proof of service the same thing as proof of mailing?
No. Proof of mailing just shows you sent something on a given date — useful for deadlines, IRS correspondence, or lease disputes. Proof of service is a legal term tied to a specific proceeding: it shows you notified a named party in the way that proceeding's rules require, which can mean personal delivery by a process server, service by a sheriff, publication, or mail — depending entirely on the type of case and the jurisdiction. Mailing something Certified does not automatically satisfy a service-of-process rule; some rules do not permit mail service at all.
Can I use paperplane's Certified Mail receipt as my proof of service?
It depends on your court and case type, and we cannot tell you that answer for your specific matter. What we can say: when a rule does permit service by mail, courts typically want the mailing date, the tracking number, and evidence of delivery (or non-delivery) — which is exactly what Certified Mail with electronic Return Receipt gives you. Most jurisdictions still require you to attach that evidence to a separate signed proof-of-service or affidavit-of-service form, not just hand over the mail receipt on its own. Check your court's local rules, your state's rules of civil procedure, or ask an attorney before you rely on this for a deadline.
What about eviction notices or HOA/lien notices — does the same thing apply?
Yes. Landlord-tenant notices, HOA violation and lien notices, and pre-suit demand letters are all governed by their own state or local rules about how notice must be given, and those rules vary widely — some accept Certified Mail, some require posting plus mailing, some require personal delivery. This page, like all paperplane content, is general information and not legal advice. Confirm the specific rule that applies to your notice type and jurisdiction before mailing.
Does paperplane offer personal service or a process server?
No — paperplane sends letters via USPS only. We do not offer personal service, a process server, or any in-person delivery method. If your jurisdiction's rule requires personal service and does not permit mail as an alternative, Certified Mail through paperplane will not satisfy it, and you will need a process server or sheriff's service instead.