New answers tagged webmail
This problem can be tackled either in roundcube, dovecot or your username-backend. Roundcube has option to auto append domain parts if no domain provided (as proposed by Kondybas). But it won't too useful in your case. Of course you can patch roundcube (with PHP language) to adding your logic. Dovecot has option to strip domain (as proposed in Dovecot ...
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