It looks like you are just sending the looped over posted values in the message. This is one way to get a forms information sent but as you can see it does not always give you the desired result. The problem with the values that are showing up as arrays is because only the name of the variable was referenced and not a subscript of the array.
For the 'best times' this is a multi select list on your page so the information will be contained in an array, the same goes for the checkboxes for confirm by.
To get around this you can use the php implode function on the array to get the values into a single string. Here is a link to the function page:
If the script that is doing the mailing is not one that you have any access to for editing I would suggest that you try a different approach for sending the info. The Universal Email tool that we offer will allow you to craft the message in DW and use the bindings like you would normally use. You can then update the code to implode the array or loop over it and print the values out one at a time. Another function that would list the contents of the array is var_dump(), but it is not very clean looking and is normally used for debugging purposes.