I was doing an email campaign based on pulling contacts per country. I noticed (for example) that if I put a comma at the end of the list: France,Denmark,Italy,Austria,Germany,The Netherllands,Netherlands,Spain,Switzerland,Ireland , - I will pull 6000+ contacts to send the campaign to but if I remove the comma: France,Denmark,Italy,Austria,Germany,The Netherllands,Netherlands,Spain,Switzerland,Ireland - I will pull 3500+ contacts.

Any reason and what is the rule of thumb to seperating after a comma? Do I need to space or not?

Hope this makes sense.