Blocked from removing Email Aliases

Blocked from removing Email Aliases

Hi, I have been testing the Email aliases to see what sort I should set up to assist with Spam reduction. I encountered the limit of about 25 email aliases and so I wanted to delete them all and start again using categories instead of individual site aliases. However I ran into the following error once I had deleted about 10 aliases:



How long until this goes away? And why do you block someone from removing aliases during setup/trial phase?