Can Emails, Messages, or Other Communications Change a Contract in Korea?

Short Answer

Yes, potentially. Under Korean law, a contract may be changed through emails, messages, purchase orders, meeting minutes, or other business communications if they show that the parties actually agreed to modify the contract.

However, later communications do not automatically amend an existing contract simply because one party sent them or the other party did not immediately object.

The key question is whether there was a clear mutual agreement to change the contract. Korean courts tend to require clearer evidence of mutual assent where the alleged amendment would materially change the parties’ rights and obligations.

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Why Does This Become a Dispute?

Commercial relationships rarely remain exactly as written.

During performance, the parties may exchange:

• Emails
• Messaging app communications
• Purchase orders
• Revised quotations
• Delivery schedules
• Meeting minutes
• Technical instructions
• Updated drawings or specifications

Over time, these communications may appear to change price, quantity, delivery dates, specifications, payment terms, inspection procedures, or technical requirements.

When a dispute arises, the parties often disagree about whether those communications were legally binding amendments or merely part of ordinary commercial discussions.

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Key Issues When Later Communications May Change a Contract

Issue 1: Does the Contract Require Formal Amendments?

Many commercial contracts provide that any amendment must be made in writing, signed by authorized representatives, or expressly identified as an amendment.

If the contract contains a written-amendment clause, informal communications are less likely to be treated as an amendment, especially for material terms, unless the parties’ later conduct shows a clear mutual agreement to depart from that clause.

This is why foreign companies should not assume that every email, message, or revised purchase order will change the contract.

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Issue 2: Did Both Parties Clearly Agree?

The fact that one party proposed a change by email or message does not necessarily mean the other party accepted it.

Silence is not acceptance as a general rule, unless there are special circumstances such as an established practice or agreement that gives silence a specific meaning.

Courts may consider the parties’ communications, negotiation history, subsequent conduct, commercial practice, and surrounding circumstances to determine whether an actual agreement was reached.

This is particularly important where the alleged amendment concerns:

• Price
• Payment terms
• Delivery deadlines
• Product specifications
• Warranty obligations
• Liability limitations
• Governing law
• Dispute resolution

The more significant the proposed change, the stronger the evidence of mutual agreement should be.

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Issue 3: Did Performance Follow the Proposed Change?

Sometimes the parties begin performing under a proposed change without signing a formal amendment.

For example:

• The supplier manufactures according to revised specifications.
• The buyer pays a revised price.
• Both parties follow a new delivery schedule.
• Updated purchase orders are repeatedly issued and accepted.
• The parties confirm meeting minutes and act consistently with them.

In some cases, performance consistent with the proposed change may be evidence of acceptance.

However, performance is still evidence of agreement, not an automatic substitute for agreement.

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Issue 4: Was the Person Giving Approval Authorized?

A practical problem in international contracts is that communications are often exchanged by project managers, engineers, sales staff, or purchasing personnel.

A technical instruction from an engineer may not necessarily authorize a change in price, delivery deadline, liability, or payment terms.

The contract should distinguish between:

• Technical instructions
• Operational coordination
• Purchase order administration
• Commercial amendments
• Legal amendments

It should also identify who has authority to approve each type of change.

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Issue 5: Do Electronic Communications Satisfy Writing or Signature Requirements?

Emails and electronic records may sometimes satisfy writing or evidence requirements, depending on the contract language and applicable law.

However, not every message automatically qualifies as a signed written amendment.

The key issues are usually whether the communication clearly shows agreement to amend, whether it was made by an authorized person, whether it satisfies the contract’s required amendment procedure, and whether the record can be reliably preserved and authenticated.

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Common Situations That Lead to Disputes

Contract amendment disputes frequently arise when:

• A project manager approves a change by email.
• An engineer sends revised drawings without a formal change order.
• A purchasing department issues revised purchase orders.
• Sales representatives discuss price changes through messaging apps.
• Meeting minutes are circulated but never formally signed.
• The parties repeatedly depart from the written contract during performance.

In these situations, the dispute often turns on whether the later communication was a binding amendment, a non-binding discussion, or merely evidence of performance.

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How Can Foreign Companies Reduce This Risk?

Foreign companies should establish a clear amendment procedure before performance begins.

A well-drafted contract should specify:

• Who has authority to approve amendments
• Whether email amendments are permitted
• Whether messaging applications may create binding obligations
• Whether purchase orders may modify the contract
• Whether technical instructions affect only specifications or also commercial terms
• Whether silence can ever constitute acceptance
• How revised versions should be identified and stored

Internal controls are also important. A company may have a strong contract on paper but still create risk if employees informally approve changes in daily communications.

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Practical Drafting Tips

Before signing a contract with a Korean company, consider whether the agreement clearly addresses:

• Amendment procedures
• Authorized representatives
• Authority matrix
• Electronic signatures
• Email effectiveness
• Messaging app communications
• Version control
• Change orders
• Purchase order authority
• Meeting minutes
• Record retention
• Notice procedures

These provisions are often overlooked during negotiations but become highly important once the project is underway.

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Conclusion

Emails, messages, purchase orders, meeting minutes, and other business communications may affect contractual rights and obligations in Korea, but they do not automatically change a contract.

The decisive issue is whether the parties actually agreed to modify the contract, viewed in light of the contract language, authority of the person giving approval, subsequent conduct, and surrounding circumstances.

For foreign companies contracting with Korean businesses, clear amendment procedures, authority controls, and disciplined document management can significantly reduce the risk of disputes over informal communications.

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