In this article we will discuss the processing of mailing where segments from multiple accounts are used for that mailing. We will proceed with the assumption that the mailing is setup in account "a" and included a segment from account "b."
1) Which Draft queue does it go into, account "a" or "b"?
It goes into the Draft queue of account "b", where the segment lives.
At time of sending the mailing, you'll see a message like this if a mailing has been setup with segments from other accounts:
2) Does the reporting show under account "a" or "b"?
The mailing to the segment from account "b" will be sent from account "b", so that's where the report for that segment will reside. Tip: Report Groups can be created across accounts to tie those mailings back together for reporting.
3) If the recipient unsubscribes, will it unsubscribe them from account "a" or "b"?
The recipient will *probably* will be unsubscribed from account "b". Why only probably?
The footer that gets attached to the mailing when content is imported will be the footer from account "a", since the mailing was originally created in account "a." Typically unsubscribe links use a merge tag to refer to the account name, which makes it dynamic. The recipients clicking the unsubscribe link would be unsubscribed from "b" and not "a" because of that merge. However, if for some reason--and this would be very unusual--the footer in account "a" contained hard-coded reference to the name of account "a", then the link would try to unsubscribe the recipient from account "a".