Yes, there is.

To notify users by email when denying the matter, use the "Process Result Notification".
Using the "Process Result Notification", you can notify applicants of the results when a matter is completed.

If you only want to send an email when a matter is denied, please set the "Process Type" in the message definition.

For details on Process Result Notification, please refer to the following documentation.

* intra-mart Accel Platform IM-Workflow specifications
　3.7.3.2. Processing result notification
　https://document.intra-mart.jp/library/iap/public/im_workflow/im_workflow_specification/texts/detail_guide/notice/ml_imb_dest/detail_guide_23.html#id7

* intra-mart Accel Platform IM-Workflow specifications
　3.6.3. Message type
　https://document.intra-mart.jp/library/iap/public/im_workflow/im_workflow_specification/texts/detail_guide/message/message_var/index.html#id7

* intra-mart Accel Platform IM-Workflow specifications
　3.7.2. Types of mail / IMBox
　https://document.intra-mart.jp/library/iap/public/im_workflow/im_workflow_specification/texts/detail_guide/notice/ml_imb_var/index.html#common-imbox

For information on setting process types, please refer to the following document.

* intra-mart Accel Platform IM-Workflow Administrator Operation Guide
　3.7. Register and set message definitions
　https://document.intra-mart.jp/library/iap/public/im_workflow/im_workflow_administrator_guide/texts/basic_guide/basic_guide_18.html

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