Send IFTTT any email at trigger@applet.ifttt.com and this Trigger fires. You can optionally add a single file attachment and IFTTT will create a public URL to the file as an Ingredient. This trigger will reject emails with attachments over 30MB.
This action will add a single row to the bottom of the first worksheet of a spreadsheet you specify. Note: a new spreadsheet is created after 2000 rows.