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How to Attach Existing Email Template in APEX Email trigger

We have web2case functionality in our company. and we want to know if perious case has been submitted by the same Webemail or Webphone field. I am sure that we can not trigger this using workflow. we need to setup APEX trigger that send email which let service team know that customer has submitted case before with same email or phone.


Any help? How can I achieve this?