I have build a Zimbra cluster with 2 nodes an i have a little problem with webmail.

first node
external = webmail.111.at
internal = zimbra.111.local

secound node
external = webmail.222.at
internal = zimbra.222.local

When i connect to webmail.111.at and the mailboxstor is on the secound node it redirects me to zimbra.222.local.
where can i configure that the redirect goes to webmail.222.at