Who this applies to: Channels that use SMS for one-time marketing messages
To prevent unauthorized third parties from using your account to send SMS messages, we’re introducing an email verification step before sending one-time SMS messages, effective October 29, 2026 (Thursday). This change is in accordance with the sender authentication requirements established by the Korea Internet & Security Agency (KISA).
You won’t be able to send SMS messages until verification is complete, so please check your login email address in advance by following the instructions below.
Note: Verification is not required for offline SMS notifications sent through Channel Talk messages, test messages, or SMS messages sent through campaigns.
October 29, 2026 (Thursday)
KISA’s sender authentication system is designed to ensure that businesses sending bulk SMS messages have measures in place to prevent illegal spam. To comply with these requirements, Channel Talk is introducing a verification step to confirm that the person sending an SMS message is the account owner. This helps protect both your sender number and your account from unauthorized use.
When you send a one-time SMS message, a verification email will be sent to the login email address registered to your account. Once you complete email verification, your SMS message will be sent. You only need to verify once per account while your login session remains active.
To ensure a consistent sending experience, this verification process applies to all countries, including South Korea.
When You’ll Need to Verify Again
When sending SMS messages after logging out or when your login session expires
When using a new sender number for the first time or changing your sender number
When sending one-time SMS messages from a different channel, even if you’re using the same account
Please check your login email address in advance by following these steps:
In Channel Talk, click your profile icon in the top-right corner, then go to Settings → Account Settings → Login Account to check your registered email address.
Make sure the email address is valid and can receive emails.
If the email address is no longer in use or cannot receive emails, please update it to a valid address.
If you have any questions about this change, feel free to contact us through Channel Talk.