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In page Prolative case:

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In Finnish, the prolative case follows an established application in a number of fossilized expressions to indicate "by (medium of transaction)".[2] It can be used in other constructions, but then it does not sound "natural".[3] Examples would be "postitse" ("by post"), "puhelimitse" ("by telephone"), "meritse" ("by sea"), "netitse" ("over the Internet"). A number of Finnish grammarians classify the prolative form as an adverb because it does not require agreement with adjectives like other Finnish cases.[4] This claim is not true, however, because an adjective will agree with the prolative: "Hän hoiti asian pitkitse kirjeitse" ("He/she dealt with the matter by way of a long letter").[citation needed]