Delete all from sender - an Applescript for the Mail.app in Mac OS X that will search for all messages set by the sender of the email message currently open and allow you to delete them all at once.

delete_all_from_sender.scpt

-- Delete all from sender - https://gist.github.com/xunker/44fa4404c882c27e0ad25857e9470552
-- For the Mail.app in Mac OS X. It will search for all messages set by the sender of the email message currently open,
-- highlight them all and ask if you want to delete them. If you choose "yes" it will delete them for you and then clear
-- the search.
--
-- Important notes:
-- You can load this in Script Editor and then save it as an application so you can run it without Script Editor being open.
-- This does not work when Mail.app is in fullscreen mode; it must be in windowed mode.
-- You will need to enable "Assistive Devices" support for Script Editor (if run there) or for the .app you saved if you converted it to a standalone app.

tell application "Mail"
	set theSenderList to {}
	set theMessages to the selected messages of message viewer 0
	repeat with aMessage in theMessages
		set end of theSenderList to sender of aMessage
	end repeat
	--set the clipboard to (theSenderList as rich text)
	-- beep
	
	set senderEmail to (theSenderList as rich text)
	--display alert "alert" message senderEmail
	set senderEmail to do shell script "echo '" & senderEmail & "' | grep -o '[[:alnum:]+\\.\\_\\-]*@[[:alnum:]+\\.\\_\\-]*'"
	--display alert "alert" message senderEmail
	
	if senderEmail is equal to "" then
		error "Broken"
	end if
	
	
	activate application "Mail"
	
	tell application "System Events"
		keystroke "f" using {option down, command down}
		tell process "Mail"
			tell window 1
				set search_text_field to text field 1 of the last group of toolbar 1
				tell search_text_field
					set the value of attribute "AXValue" to senderEmail
					--keystroke senderEmail
				end tell
			end tell
		end tell
		
		--tell application "System Events" to keystroke "f" using {option down, command down}
		key code 36 -- press RETURN key       
		
		
	end tell
	
	
	
	delay 0.5
	
	set msgs to {}
	tell application "Mail"
		set message_list to message viewer 1
		set msgs to every message of message_list
		
		tell application "System Events" to tell process "Mail" to keystroke "1" using command down
		
		tell application "System Events" to tell process "Mail" to keystroke "a" using command down
		delay 0.5
	end tell
	
	set the message_count to the count of msgs
	
	set userCanceled to false
	try
		set dialogResult to display dialog "Delete these " & message_count & " messages?"
	on error number -128
		set userCanceled to true
	end try
	
	set clearSearch to false
	
	if userCanceled then
		-- display alert "alert" message "OK, not deleting nothin'!"
		try
			set clearDialog to display dialog "Clear search?"
			if button returned of clearDialog is "OK" then
				set clearSearch to true
			end if
			
		on error number -128
			set clearSearch to false
		end try
	else
		if button returned of dialogResult is "OK" then
			tell application "Mail"
				--       --display alert "alert" message "your message"
				--       --activate application "Mail"
				tell application "System Events" to key code 51
				delay 3
				--       repeat with i from 1 to the message_count
				--         set this_message to item i of msgs
				--         delete this_message
				--         delay 0.5
				--       end repeat
				
				set clearSearch to true
			end tell
		end if
	end if
	
	if clearSearch then
		tell application "Mail"
			tell application "System Events"
				keystroke "f" using {option down, command down}
				key code 53 -- press ESC key
				keystroke "1" using command down
			end tell
		end tell
	end if
	
	
end tell