Tried it many more times with different tags...

I sent a letter to the otrs mail with the following subject: "This is a test letter." and recorded different replies, depending on which tags I used...

For the results I edited the SUBJECT field of >> Admin :: Auto Response :: any auto-reply ticket type, and then chose that ticket for the auto-reply function in >> Admin :: Auto Response <-> Queue :: auto-reply

So... this is what I received...

[Company_Name#: <OTRS_TICKET_TicketNumber>] Re:

Sends this: [Company_Name#: 1000612] Re:

[Company_Name#: <OTRS_TICKET_TicketNumber>] Re: <OTRS_CUSTOMER_Subject>

Sends this: [Company_Name#: 1000612] <OTRS_CUSTOMER_Subject>

[Company_Name#: <OTRS_TICKET_TicketNumber>] Re: <OTRS_CUSTOMER_SUBJECT[24]>

Sends this: [Company_Name#: 1000612] This is a test letter.

Re: <OTRS_CUSTOMER_SuBJECT[24]>

Sends this: [Company_Name#: 1000612] This is a test letter.

I'm confused really... one thing that I think of, is that OTRS doesn't support more than one tag in the subject field. But on the other hand... why doesn't it show the "Re:" when I use only one tag? And how can I put it in between the Ticket number and the subject of the ticket? In the end, using the above examples I want to have this in the auto-reply emails:

[Company_Name#: 1000612] Re: This is a test letter.