Gmail allows you to do extension addresses like "myname+company@gmail.com", which I've used since switching away from my own mail server where I did the catch-a

Gmail allows you to do extension addresses like "myname+company@gmail.com", which I've used since switching away from my own mail server where I did the catch-all. Some places are rejecting "+" in the address though. I was trying to give on to Dell and the tech I was talking to told me the system wouldn't accept the address, but that the "+dell" was just an extension "so can I put it in without that?" The combination of them knowing that this was valid and just wanting to strip off the extension kinda blew my mind for some reason.