How to set a custom fields value if a comment contains text

[Bla Keks]

I'm trying to make a "sync" between our JIRA for development and our customers ticket system based on the status. 

e.g. the customer wants a new feature, he adds a ticket in his ticket system. This tickets has got a Name, an ID and a Status. In our JIRA there is a related ticket with custom fields like customer status and customer ticketID. now if the customer changes his status, an automated mail goes to our JIRA containing the text: Customer XY changed the Status of Ticket XXX from AAAAA to BBBBB. Now i need an workflow / something to read those email, search for the corresponding JIRA ticket (Ticket with customer ticketID = XXX) and set the value of the custom status field to BBBBB.

I tried to use some workflow addons but i cant figure out how to do this 

[Nic Brough -Adaptavist-]

You'll need to write a new email handler that can do the parsing you need.

Personally, I'd not bother, I'd just get K15t's Backbone or iDalko's Exalate add-on and synchronise the projects.