Ticket creation through email

[Sarika S Nair1]

How to create a ticket in servicenow through emails received to common mailbox instead of servicenow instance mailbox?

For example, suppose  abc@gmail.com is the common mail id.And if users sent emails to this mail id for creating tickets how we create incident records as per this email.

[Anurag Tripathi]

Think about it.  How can you create tickets between 2 completely unrelated systems. 

There has to be some link.