With that out of the way, whenever you want to send a large file, you just drag it into a new email message in Mail, as you normally would. When you send the message, CargoLifter by default displays an alert box asking if you want to upload the attachment(s) or send them normally. Click Upload Attachments, and CargoLifter automatically uploads the file(s) to your cloud-storage service, displaying a progress box during the upload.
When the upload is finished, CargoLifter removes the attachment(s) from the message and replaces them with the appropriate download URL(s). It also appends some basic text explaining to the recipient that your attachment(s) are available online; the text includes the download name(s), the total size of each download, and the URL(s). You can then send the message.
If you want to make this process even more seamless, you can disable the attachment prompt (so that CargoLifter automatically uploads attachments without asking) and enable automatic sending (so that CargoLifter immediately sends your message after uploading your file[s] and including the resulting URL[s]). With this set of options, Mail functions exactly like it always has...except that you're not burdening your messages with attachments.
You can tweak CargoLifter's behavior so that it uploads (or prompts you to upload) only if the size of any single attachment, or of all attachments together, is greater than a certain amount. You can also have CargoLifter automatically compress files, and combine multiple files into a single archive. And if you don't like CargoLifter's default download-info text, you can provide your own.
If your cloud-storage space is limited, you'll want to periodically go through whatever directory CargoLifter uses to store files (for Dropbox, for example, it's /Apps/CargoLifter) and remove any older attachments that you're confident your recipients have already downloaded. I'd like to see CargoLifter include a feature to automatically delete attachments after, say, 30 days. I'd also like the option to have CargoLifter use a custom URL-shortening service.
If you send large files only occasionally, CargoLifter probably isn't for you. But if you regularly include attachments—and especially large ones—in your email messages, CargoLifter can streamline your workflow to the point where you'll soon forget it's not a feature included in Mail.
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