Yes. Really all that they have to do is turn off deprecated messages in their php.ini file, or they have to update to the latest version of our email extension, which would have this warning fixed.
Unfortunately I'm too lazy to track them down to help them fix it. Maybe I should, I could probably get an upgrade to DataBridge sale out of it ;)
I have a hard enough time keeping up with answering questions people come to me with. I'm not ready to start working on finding issues on sites using webassist extensions to pro-actively answer questions before they ask them.
If you feel compelled, they have a phone number listed and you could call and point them to this post for the solution.