Domains

Hello,

I am migrating to postgresql from another database. I want to take
advantage of using domains. Let's suppose I create domain
'email'(varchar 128). Then I change my mind and want to increase all
columnst that have type 'emaill' to varchar(255). How do I change the
domain 'email' to the new datatype. I can not figure how to do it with
"alter domain" syntax.

Thanks in advance for your help :-)

Kind regards,

Peter