Deleting a large number of old email messages

Another thread asked how to delete all the emails in a yahoo webmail mailbox.  I suggested the technique documented here.  Assuming that actually works below is a possible extrapolation of that technique that I think might work to select a date range of a maibox instead of the entire mailbox.

1. Click the "All" at the left of the search box to display a drop down menu.
2. In that dropdown menu Select the mailbox you want to delete the emails from and then click "Advanced search" near the bottom of that menu.
3. In the advanced search box, in its Date box, select "Custom date...".  Enter the "to" date in the indicated format.  Leave the start date blank.
4. Click the "Search Mail" button.
5. Now the procedure should be the same as for selecting all emails in a mailbox, i.e., ​press Ctrl-A (Windows, Linux) or Command-A (Mac) to select all the messages and do the delete action from the toolbar.

Hope this works for you.

This didn't work for me, but I figured out another way:

1. Open yahoo mail in chrome {choose the full desktop view if you're on mobile}. 
2. Click the search bar for your inbox and type in "mail". Then click, "search mail" button to the right. 
3. When the results appear, tick the box on the top left that highlights all the emails {this may take a moment if there are thousands}.
4. Click the trash-can to delete {a dialogue box should pop up confirming that you want to delete "x" amount of emails - click "ok".} 
5. It may take a few moments to delete them all, and a progress bar will appear. Just be patient. 
6. Do this a few times - the number of emails will vary each time. 
7. Continue the "search, check + delete" steps with various phrasings like, "news", "subscription", etc. until all your unwanted emails are goneskies. 

@mtndwells:

The OP asked the question on how to delete all emails prior to a certain date?   If you want to delete all emails in a mailbox then the suggestion in this other thread apparently works.  The OP for this thread has yet to come back with a followup on whether what I suggested works for what he is trying to do after he fixes his mail format to "full format".

Hi, this thread is awesome.

You can delete multiple emails at a time without any hassle with the multiple emails deletion tool as well as there's also a manual option.

• Open the specific email folder that you want to delete from.
• After that, select multiple or all emails, and click the Delete to remove them.

YOu can also use shortcut keys, press Shift + Delete keys together to delete all emails permanently.