[SOLVED] Change Ticket Value from E-Mail via Postmaster

[thr]

Hello together,

once again i am sitting on a problem with OTRS. Basically what i am trying to do is this:
1) An OTRS Agent creates a Ticket for a Problem.
2) Then he sends out an email via OTRS to a customer with a question about the ticket
3) Then the customer answers the E-Mail (from his local email client) with a specific information, that changes the value of a dynamic dropdown-field in his ticket automatically, so the agent does not have to do it.

1) and 2) are working, but 3) does not. I have seen in the documentation, that this might be possible with the PostMaster in OTRS. Am i correct in the assumption, that I need a mail-address that really exists on my exchange server, which has to be assigned in the "Postmaster E-mail" and OTRS then can listen to this address and check the incomming mails??

Assigning the values with the PostMaster seems to be pretty clear. I will use something like "X-OTRS-DynamicField-<name>" and "nextValue" to assign it, but how do i filter out this one ticket, i want to do that in?
I thought about a filter with the ticketnumber, because the answer from the customer (see 3) ) will have the number in the email-Subject, but this option does not exist. Is it possible in a different way??

[crythias]

after the ticket is created, any change in value usually is X-OTRS-FollowUp-Key:value.

[thr]

Indeed, got that working.
I created an email-Address, where OTRS can listen to mails, for this mail i set up the Filter to get my Ticket. And with the "FollowUp"-Option i can change specific values, exactly what i hoped to accomplish.

Thanks very much