This question is in reference to Atlassian Documentation: Receiving requests by email
One of our client's email is diageo@service-now.com. Every time they send an email from this account to our service desk email account (support@issyapp.com), JIRA does not register this issue.
Note: from any other email account, JIRA has no problem registering the issues.
Note 2: We have checked on the email server the support@issyapp.com account, and we can identify the emails from diageo@service-now.com entering without any problems (these are entering into the inbox directory, in other words not entering into spam).