Usability when creating mailboxes

[SB]

Hello,

I have noticed when on a specific domain page (/admin/box/?query=<domain>) say mydomain.com … clicking 'Create new email address' for that particular domain then selects your server domain as the initial default choice, but would it not be expected to default to the mydomain.com - the one you are creating the mailbox for?

[SH]

fix #437 usability when creating mailboxes

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