The courts have adapted to new technologies by allowing responsive pleadings to be served by express mail, fax, or electronic delivery. Each one of these options has pros and cons, and it is important for the serving party to determine which option is best for their needs.
Remember: Case initiating documents can ONLY be served by personal service.
Service by Express Mail: Notice of motions and other papers are served when the serving party sends them:
Service by Fax: Service by facsimile transmission (fax) can ONLY be made when both parties agree to service by fax, and written confirmation of that agreement has been made. When faxing, the papers must be faxed to a fax machine maintained by the person who is being served. The telephone number for that fax machine should come from any document which the person being served has filed in the case and served on the party making the service. Service is deemed complete at the time of the fax transmission.
Electronic Service: Electronic Service means service of a document, on a party or another person, by either electronic transmission or electronic notification. Electronic service of a document is deemed complete at the time of the electronic transmission of the document or at the time that the electronic notification of service of the document is sent.
When serving by Express Mail, the party should prepare documents in the same manner as when using service by mail. Service is complete at the time of the deposit. Service by Express Mail extends any period of notice and any right or duty to do any act or make any response by two court days. (California Code of Civil Procedure §1013(c)).
Filing Party
Filing Party, Server, or Anyone Else
Service by facsimile (fax) is permitted only where the parties agree to service by fax AND a written confirmation of that agreement is made. (California Rules of Court 2.306(a)(1)).

Where to Serve a Party by Fax
When Service is Complete
Transmission must be made prior to 5:00 P.M., or service is considered to be the next day. Service by fax is completed at the time of transmission.
Fax service extends any period of notice and any right or duty to do any act or make any response by two court days (California Code of Civil Procedure §1005(b)).
Proof of Service by Fax
Proof of Service form POS-040 includes all of the requirements for Proof of Service by Fax laid out in the Code of Civil Procedure §1013(a) and the California Rules of Court §2.306(h). The form must include:
If the Proof of Service does not have all of the required information, it is ineffective.
IMPORTANT NOTE: Parties can only be served by electronic service by consent. (California Rules of Court 2.251)
What is Electronic Service
Electronic service means that the document is served on a party or parties by either electronic transmission, or by electronic notification.
Electronic transmission means sending the document to the electronic service address (e-mail address) where the other party has consented to electronic service.
Electronic notification means sending a message (e-mail) to the electronic service address where the other party has consented to electronic service that gives the name of the document and a hyperlink to the location where the document can be viewed and downloaded.
Electronic Documents & Signatures
Generally: A document that is filed electronically shall have the same legal effect as an original paper document.
Signed: When a document requires the signature of any person, not under penalty of perjury, the document shall be deemed to have been signed by the person who filed the document electronically.
Signed Under Penalty of Perjury: The document will be considered signed IF EITHER:
A party or person consents to electronic service by:
A party or other person that has:
Consents to service on that EFSP as their designated agent for service, until they designate a different agent for service.
If you have filed paperwork from an electronic service address, that address will be assumed as valid until a change of service address form has been filed and you serve notice that the address in no longer valid.
To Change Your Electronic Service Address
To change your electronic service address while the action or proceeding is pending, you must promptly file a Notice of Change of Address (MC-040) electronically with the court and must serve this notice electronically on all other parties and all other persons required to be served.
Even if you use an Electronic Filing Service Provider (EFSP) to electronically file and serve documents or to receive electronic service of documents on the party's or other person's behalf, you STILL have to file the Notice of Change of Address form (MC-040).
Integrity of Electronic Service
If you serve documents electronically, you MUST:
Completion of Service
If a party has consented to electronic service, the service is complete at the time of transmission.
If the document is transmitted:
Time to Respond
Being served electronically adds two court days to any:
BUT, electronic service does not extend the time for response for: