setup email accounts for postmaster and replies

[MCCoolMoDAue]

Hello,

we have a mail account that gets all the ticket correspondence from customers.
postmaster picks up the mails, all fine.

When we answer the ticket by mail, the postmaster address is in CC.
This means that the email will be picket up again by the postmaster and added to the ticket.
This doesn't seem right?! Do I need a postmaster filter?

- eventually we want to have a mail account that will keep all correspondence, including the answers from OTRS. let's call it "service@company.com"
- This account will forward all emails to another account that will be used to fetch mails by the postmaster. let's call it "otrs@company.com"
- The answers should go "service@company.com" as CC in the answers.

Is this scenario possible?
how do i reply to an email address other than the postmasters?

edit:
strange in our configuration is that the answer email form shows the postmaster address "otrs@company.com"
in "From" and "CC".
That does not make sense to me

[MCCoolMoDAue]

looks like we will setup the environment like this:

one mailbox will get all mails from and to customers. mailbox A
it will forward to an internal mailbox. OTRS will fetch mails here. mailbox B

Answers will be CC'd to mailbox A. A filter will prevent those mails to be forwarded to B to avoid duplicates.

I don't know if this is a usual setup. But it should work for us.