Getting info from Excel to be comma delimited with no spaces

Hi, I am new here so I apologize for this post if it's already in another thread. I do not work with Excel other than the super simple basic stuff that my 3 year old could probably figure out. However, I have to take info from Excel that is in 4 different columns and put it in our company's eblaster in comma delimited format with 0 spacing between.

So I need this:

email@email.com John Public ABC Company (where each piece of information is in column A, B, C & D in Excel respectively)

to look like this:

email@email.com,John,Public,ABC Company

It's ok if there are spaces inbetween the names in the company column, but I can't figure out how to take that information and quickly and easily change it. In the past, I've always done a simple copy/paste from Excel into Notepad, then sat and manually entered commas and deleted the spacing between. That's fine if my list is less than 100, but I have a very large list and don't have the time to manually change it all right now. Here's to hoping there's a fix!

Thank you humdingaling, that worked great!