According to the state-run Mehr news agency, Iran’s Information Technology Organization and the Telecommunication Infrastructure Co. have said they are unaware of the issue. The head of the former, Saeed Mahdioun, said any problems wouldn’t fall under his group’s responsibilities, adding that he doesn’t use foreign e-mail services.
Khamenei has also issued a "fatwa" against using anti-filtering tools. The catch? His own fatwa was filtered by the state, probably for containing the words "anti-filtering" (Iranian filters are notoriously unsophisticated). While plenty of Iranians use "mirrors" to access the unfettered web, there is indication that the government could begin cracking down more on those who do.
Iranian authorities are also mulling plans for Iran to get its 'own Internet.' We'll let you know of any updates.