[adg001]

I use a combination of the following search terms to find the emails to select and delete:

  * larger:XXXmb (e.g., larger:10mb)
  * in:promotions
  * in:forums
  * in:unread

It would be helpful to have the chance to filter those emails not marked as being important. However there is no such feature at the moment, akaik.

[OOvsuOO]

That is a good tip. I've never used that search method.

Any idea how to delete all emails of a search without having to go though multiple pages? This is not possible?

[adg001]

Yep, start by selecting the emails matching your search term by clicking the mark in the top left corner. Then click the link 'Select all conversations that match this search', and the selection will be extended to all the entries across multiple pages. You can now delete them all.