Changes to finished projects

Hello! I was wondering if it is possible to disable the automatic emails that are sent to vendors temporarily (and **easily!**). I ask this because sometimes we have to make changes to projects once the have been marked as "finished" and we have to reopen the projects (not the type of changes you can make without reopening), so the vendors involved in the project receive an email saying they have a new project, which is not true, it's just the project they just worked in, that we had to reopen to make the change we needed. So, is there a way we can avoid sending out those mails when we reopen a closed project? Thank you!