Internal e-mail access via OWA

[akamenov]

Hello everybody. I'm the only BB user in our company (BB has just officialy come to Russia), so I'm unlikely to receive any help offline.
Some time ago, I had a real e-mail address (login@somedomain.ru) and used to access it via OWA.
Yesterday our IT blocked real addresses (honestly, I don't really use it) so now I only have internal e-mail login@ other.local.
I still can use OWA from my laptop, but when I try to connect via BIS it says
it can't find mail server for other.local.
Interestingly, I could still access my e-mail for some time even after the e-mail was changed, but I couldn't send e-mails. When I tried to re-create the BIS account, even receiving was gone.
Does anyone have the same setup? Or any ideas about possible workaround?