When we create issues via email channel, it creates a task without any issues.
But only half message is a description, a signature is added as an activity to it.
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Is there is way to prevent it?
Yes, when you use the email channel it creates a request.
I am sorry, I do not understand the rest of the question. "Without any issues" does not make sense, because a request cannot exist without a single underlying issue, which is always created too.
The second sentence in your question does not make any sense at all, I cannot work out what you might be describing.
And hence, I do not know what you are trying to prevent.
I meant technically there is no issue in the process of creating case or task, like, fail to create, etc..
when I send an email to create a task, one half of the message is added as a comment/response to the task.
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