Laptop can't see server on wireless
I have a strange problem that I can't resolve. With a few laptops (not all of them as mine is fine) when that are connected to the wireless network they can't see the mail server. I've tried to ping the mail server via cmd prompt and no response. They log on fine and when connected via cable all is good.
As I said it is on some laptops not all of them. I've checked the DNS and no settings seem out of place. Any suggestions really appreciated on this!