Tosefta על ראש השנה 1:3

There are two presumptions [to establish a putative Kohen's status in the priesthood] in the Land of Israel: the Lifting of the Hands [for the Priestly Benediction] and the distribution [of Terumah] on the threshing floors (see Ketubot 25b:2). And in Syria, and until the places that the messengers of the new month would arrive (Rosh Hashanah 1:3), [a putative Kohen's status is established by] the Lifting of the Hands, but not by the distribution [of Terumah] on the threshing floors. And Bavel is like Syria. Rabbi Shimon ben Elazar says, "So too, in Alexandria, in earlier times when it had a [Jewish] court."