What verification occurs on emails that Jira processes

[Adam Steele]

We are looking to use inbound emails that Jira will parse as part of a data transfer between one of our Clients and ourselves. I'm trying to establish what level of trust those emails and their attachments can be given. I'm assuming that Jira performs verification against the emails, but I can't find any documentation on what verification it performs. Can anyone provide me documentation or even a list of what it will and won't do?