And then thirdly, there is mail from unknown sources.
"Suffolk does not accept research funds from unknown sources," the spokesman said in an email.
Resist the temptation to buy drugs on the Internet or from unknown sources.
Unsolicited mail from unknown sources "doesn't even make it out of the mailroom," said Adam Rothberg, spokesman for Simon & Schuster.
Bits of costume are sold at every corner shop, scraps of brass-band music lilt from unknown sources.
The best way to avoid infection, experts advised, is not to open e-mail attachments from unknown sources and to keep antivirus software up to date.
(The administration has said nothing thus far about whether current cyberattacks from unknown sources on the Iranian nuclear program's computers would lengthen these estimates).
Defense Minister Juwono Sudarsonso, in a recent interview, said there was no way to stop them from boarding interisland ferries and traveling to the area, where they then received weapons from unknown sources.
Although he operates commodities trading and export businesses in Bergen County, they have never posted a profit, investigators say, and his only known sources of appreciable income have been wire transfers from unknown sources in Korea.
CT and MRI comprehensively investigate complicated urinary infections and sepsis from unknown sources.
Verify incoming transmission Do not accept and run attachments from unknown sources unless you are expecting them.
