We have a jira service desk server and we use 3rd party email providers like gmail(inbound) and sendgrid(for example, outbound). Everything works fine except that:
some of our customers send emails to our Gmail address, we received the email(didn't open it manually), jira marked them as 'read' and created a customer user automatically, but no issue was created.
we guess that there is a spam filter inside jira SD which need configuring. so how should we configure it or disable it?