I was hoping to be able sort my gmail by subject or sender and delete large amounts of gmail at one time. How can I sort, view, select, and delete large amounts of gmail at one time?
Best do do this via on-line in Gmail. Management of large amount of e-mail through IMAP will cause longer delays in response.
If you insist to do through eM Client, the usual methods are use as if you were in Explorer. Search filters, Ctrl+A to select all; select one mail, hold shift and a second one to highlight the mails in between; or hold ctrl and chose the mails, etc.