Hi @sachin kumar ,
please share your incoming mail handler configuration. There are some options that prevent email to create issues (for example Catch Email Address) so, probably, some email could not produce a ticket creation.
Please take a look here for further information https://confluence.atlassian.com/adminjiraserver/creating-issues-and-comments-from-email-938847641.html
Hope this helps,
it seems ok. Please take a look to the following article https://confluence.atlassian.com/jirakb/troubleshoot-mail-handlers-in-jira-server-211649643.html#:~:text=Check%20to%20see%20if%20the,correctly%20in%20the%20JIRA%20application.
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