Spam filter question

Spam filter question

We have several teams that are talking to themselves between the mailboxes configured for each of their group in service desk plus but this ends up creating e-mail loops. You get the acknowledgement request from one side and then the acknowledgement request from the other side and so on and so forth. So if I add their e-mail address to the Spam filter in the "Sender is" field, whenever a groups tries to talk to the other group will it still leave the e-mail come through since it has a ##requestis## in the subject line or since the sender is blocked it won't let it go through at all? If my suggestion doesn't work, how could I solve the issue?
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