Hello, an open request exist in the Atlassian JIRA :
https://jira.atlassian.com/browse/JRA-15129
You can have a look inthis documentation, split regex parameter
http://confluence.atlassian.com/display/JIRA/Creating+Issues+and+Comments+from+Email
Some plugin could add more option, like JEMH provides body delimiter regexps and allowing signatures to be stripped, etc"
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