Is it possible to manage email accounts using PHP?At least I want to add/delete mail addresses for a domain using a web page hosted on my site (which is not dreamhost control panel)
If you mean hack into your Panel from a script then yes, it's do-able.
I'd strongly suggest against implementing such code (security/abuse issues).
Maximum Cash Discount on any plan with MAXCASH
How To Install PHP.INI / ionCube on DreamHost