Email add on with Gmail

Email add on with Gmail

I just signed up for the mail add-on.  I use Gmail and have 30,000 emails in it.  Zoho seems to be importing from Gmail at about 100 and is importing the oldest first. 

Is there a way to mass delete the emails in Zoho - I don't want all of those old emails in there!  
And is there a way to have it pull the new emails not the old ones?

Thanks,

Cheryl