Exist a way for access my webmail without using a port ?
firewall problems.

greetings.

Unfortunately there is no way except if you will install your own webmail system.
In that case you will be able to access it without using a port.

Ok, i will going for installing my own webmail (horde) in my main account wizhosting.com.ar, soon.

Some tips for me ? or i just need to download horde imp and install it normally follow horde Howto.

{question: all my clients from my reseller account, will can go to http://wizhosting.com.ar/XXX and check your mail accounts in the webmail ?}

Thanks!

Yes, they will.