Compound of <span class="searchmatch">簡易</span> (“simple”) + <span class="searchmatch">メール</span> (“mail”) + <span class="searchmatch">転送</span> (“transferring”) + <span class="searchmatch">プロトコル</span> (“protocol”), calque of English Simple Mail Transfer Protocol. IPA(key): [kã̠ɰ̃i...