Allow multiple Service Desks with distinct customer lists to use the same Email Address

Scenario

In certain cases, it may happen that:

1. project SD1 has customers sd1cus1, sd1cus2
2. project SD2 has customers sd2cusA, sd2cusB

in other words, they have 2 totally different customer lists

In such a case like this, the 2 projects should be allowed to use the same email address for Email requests, in which:

• if sd1cus1 sends an email to this email address, JIRA detects that this customer belongs to SD1 only and will raise a request in SD1
• if sd2cusA sends an email to this email address, JIRA detects that this customer belongs to SD2 only and will raise a request in SD2

Suggestion

When multiple SD projects meet the following requirements:

1. each project has a distinct customer list in which no customer exists in more than one service desk
2. public signup is not allowed and all projects have Request Security set to "Only people on my customers list"

they should be allowed to use the same email address for Email requests.