I am an extensive user of filters when it comes to mail, so does all my employees.

We just switched to Zoho mail and now we have a big problem: filters show weird unpredictable behaviors.

Take this example: i have a mail form " Accounting.Dept@digikey.com". I want all mails comming from or going to @digikey.com to go in one folder. so i set up this rule:

but no matter what i do, the rule won't apply to the inbox folder when i try to apply it.

It says "filter has been scheduled" then is says something like "done", but the mail stays there in inbox. 

Then, out of despair and re-re-retries, it finally works, but i don't know why or how?!

It's extremely frustrating that i can't seem to figure out what the logic behind this (which should be very simple logic, by the way) 

Sometimes things work OK, sometimes filters never work, sometimes it takes minutes or retries.