When a profile replies to an SMS message which was sent via Campaign, you can configure messages which are automatically sent back to him as well as the action to perform.
This configuration is defined in the Automatic reply sent to the MO section of the SMS Routing external account. MO stands for 'Mobile Originated', which means that you can configure an auto-reply to the mobile who sent the SMS.
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For example, in the configuration below, if recipients send the keyword "STOP", they will automatically receive an unsubscription confirmation and their phone number will be sent to quarantine with the Blacklisted status. This status refers to the phone number only, the profile is not blacklisted so that the user continues receiving email messages.
Your recipients can now be automatically unsubscribed to your messages and sent to quarantine with this automatic reply. The quarantined recipients are listed in the Addresses table available through the Administration > Channels > Quarantines menu. For more information on quarantines, refer to this section.
These incoming SMS can be stored if needed. For more information on this, refer to this section.
In the SMS routing via SMPP external account, you can choose to store incoming messages for example when a subscriber replies "STOP" to an SMS message in order to be removed from your recipient lists.

By checking Store incoming MO in the database in the SMPP channel settings category, all SMS will be stored in the inSMS table and can be retrieved via a query activity in a workflow.
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Edit the properties of your workflow, then click Create . For more on workflows creation, refer to this section.