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If you want to send welcome email to the user subscribed to the specific mailing list in this example to a Newsletter, you can do so using Sitecore Send Automation.
In this case there is no OOTB automation available. Will crate a custom automation instead
To see how to setup a Subscribe abd Unsubscribe using javascript see this blog
Setting up Custom Autmation to Thanks user for subscribing to the Newsletter
Navigate to Automation and New –> Custom automation
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Setting up Automation for welcome email-
This is avaiable in automation recipe-
Navigate to Automation and New –> From recipe
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Update title and description of automation-
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Select the trigger-
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Choose the List Engagement option – When someone subscribes to a specific list
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In this case I am choosing the Newsletter Email List- created in my other blog
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This should update the automation-
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Next add the condition or control step
For this example will choose – Wait a specific time interval-
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So after the user subscribes to Newsletter the wokflow will wait for 1 minute to perform further action.
Select Send mail campaign action-
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Fill in the appropriate fields and create action-
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Automation Worflow should look like this-
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Imp- do not forget to activate the automation workflow.
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On subscribing to newsletter-
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You should be able to see the user added to the Newsletter mailing list-
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After a minute you should be able to see custom automation is triggered-
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Result- Email been sent after subscription-
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You can also choose the exisitng recipe but this has the trigger to send mail if the user subscribes to any list.
Choose Welcome email sequence option-
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This should ne now available in Automation Workflows in an Incomplet state-
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Should show up with the option to setup the Automation Workflow-
Might see mulitple such steps- update as per your requirements
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Click on the Trigger – When someone subscribes to any list as highlighted