Whenever i try to delete an email, the line only gets crossed out.
Using IMAP, mails you delete are only "marked as deleted" and hence still use disk-space. Some Email clients just hide these marked emails, others show them in light gray or crossed out and others move them only to the Trash. In any case you still need some more steps to finally purge these emails. See below to see which steps are necessary for your email client:
- Press "X"
After having moved your mails from the inbox to the other folder, use Mailbox->Erase Deleted Item from the menu or press Command-Shift-Backspace.
Select the mailbox and choose Compact Mailboxes from the File menu
- Outlook & Entourage
Select the Folder Menu, then search the Purge Icon. Finally either choose if the mails in this folder, this account or all accounts should be purged.
- Once you have deleted any items that you no longer need, click on the Trash folder in the left Panel. Click on the cogwheel icon in the bottom left of the screen. Click empty.