mrilu -mri-mril- gismu

x₁ mails/posts [transfer via intermediary service] x₂ to x₃ from x₄ by carrier/network/system x₅

Also x₄ post office, mailbox. (cf. benji [in which the medium need not be a 3rd party service/system, and x₂ need not consist of discrete units], notci, xatra, tcana)

lensisku

In notes:

benji: x₁ transfers/sends/transmits x₂ to receiver x₃ from transmitter/origin x₄ via means/medium x₅.
ensemsku: x₁ sends an SMS; x₁ sends SMS x₂; x₁ sends SMS x₂ to x₃
fairbei: b₁ distributes b₂ to b₃ from b₄ over path b₅. b₁ is a distributor.
frankobolo: x₁ is a document used to prepay service x₂ like postage costs, tax, license fees; x₁ is a postage stamp used to pay service x₂
mribriju: x₁=b₁ is a post office of post clerk x₂=b₂ at location x₃=b₃ for mailing system x₄=m₅.
mriste: l₁ is a mailing list with subscribers/recipients l₂=m₃.
notci: x₁ is a message/notice/memorandum about subject x₂ from author x₃ to intended audience x₄.
samymri: m₁ (agent) sends e-mail m₂ to person / computer m₃ from person / computer m₄ by computer network m₅.
tcana: x₁ is a station/node of/in/on transport/communication/distribution system/network x₂.
terbejbi'o: be₃=bi₁ signs up / subscribes to be₁ for publication be₂ from be₄ by means be₅.
xatra: x₁ is a letter/missive/[note] to intended audience x₂ from author/originator x₃ with content x₄.