Mail rule problem (mail sent twice)

I have one MailR6 database where several rules are defined.Most of rules look like this:

  • send a copy to recipient(s)

  • move to a folder

All the rules works, but one of them is strange. It generates two identical mails when sending the copy. There are two recipients addresses defined in “send a copy” action, but it should not be a problem. If I remember well, it started to “annoy” after I temporarily added second action “send a copy”. I deleted the second action after a week but it is still sending two identical copies.

I tried to delete the rule and create a new one, with no positive result. The only moment when it stopped sending two copies was after changing the condition (e.g. from sender contains domain.com to sender contains domain.co).

Any idea what to do with this is appreciated very much …

Mail template is 6.5.4, server is 6.5.3