I have a dedicated mailbox where I keep receiving mails from several clients. Now I have to split and forward it to 2 bot mailboxes. Any ideas on this. 

Note: I am not getting all mails at one go or in regular intervals to get the count , equally divide and forward to bot mailboxes. 

Is there any way to auto-forward alternate mails from one mailbox to other mailboxes through settings or script?

Any help is greatly appreciated.