指用來收信或投遞信件的公共或私人箱具。至於向郵局租借的信箱，則稱之為「郵政信箱」。「郵箱」一詞原指郵車或郵船上放置郵袋的箱子。在英式用法裡，「郵箱」通常指在私人地產上，架於柱子上者，而「郵筒」則通常指置於公共場所體積較大者。

郵筒(P,,U,繁體中文-偏好,D,U,U)
郵箱(,U,繁體中文-非偏好,UF,,)
yu t'ung (P,,U,韋氏拼音-偏好,UF,,)
yóu tǒng (P,,U,漢語拼音-偏好,UF,,)
you tong (P,,U,漢語拼音(無聲調)-偏好,UF,,)
mailboxes(P,,U,英文-偏好,D,U,PN)
letter-boxes(,U,英文-非偏好,D,U,PN)
mailbox(,U,英文-非偏好,AD,U,SN)
letter-box(,U,英文-非偏好,AD,U,SN)
letter boxes(,U,英文-非偏好,UF,U,N)
mail-boxes(,U,英文-非偏好,UF,U,N)
mail boxes(,U,英文-非偏好,UF,U,N)
brievenbussen(P,,U,荷蘭語-偏好,D,U,U)
brievenbus(,U,荷蘭語-非偏好,AD,U,U)
boîtes aux lettres(P,,U,法語-偏好,D,U,PN)
boîte aux lettres(,U,法語-非偏好,AD,U,SN)
buzones(P,,U,西班牙語-偏好,D,U,PN)
buzón(,U,西班牙語-非偏好,AD,U,SN)

藝術與建築詞典根目錄
....物件層面
........組件 (層級名)
............成分
................<依特定背景區分之組件>
....................<系統組件>
........................<基礎設施元件>
............................<交通運輸元件>
................................<道路與路側元件>
....................................街道設施
........................................郵筒

distinguished from....

郵政信箱

英文....	Public or private containers for pickup or delivery of mail. For rented compartments in officially designated post offices, use "post-office boxes." The term formerly referred to boxes in which the mailbags were placed on a mail coach or steamer. In British usage, "mailboxes" typically refers specifically to such containers placed on a pole or post on a person's property, while "letter-boxes" typically refers to the larger boxes located in public places.
荷蘭語....	Wordt gebruikt voor zowel openbare als privé-bussen voor het ophalen en afleveren van post. Gebruik 'postbussen' voor gehuurde compartimenten in officieel daarvoor bestemde postkantoren.
西班牙語....	Úsese para cajas públicas y privadas para recoger y distribuir correo. Para compartimientos alquilados en oficinas de correos oficialmente designados, usar "casilla postal."

郵筒............	[AS-Academia Sinica]
.................	朗文當代大辭典 1001, 1061
.................	智慧藏百科全書網 September 13, 2011
郵箱............	[AS-Academia Sinica]
.................	國家教育研究院－雙語詞彙、學術名詞暨辭書資訊網 May 28, 2010
.................	牛津當代大辭典 1110
mailboxes............	[VP]
.................	CDMARC Subjects: LCSH (1988-)
.................	Avery Index (1963-) (source AAT)
.................	Random House Dictionary of the English Language (1987)
.................	BHA Subject Headings (1985-)
.................	Oxford English Dictionary Online (2002-)
.................	Nomenclature 3.0 for Museum Cataloging (2010)
letter-boxes............	[VP]
.................	Oxford English Dictionary (1989)
.................	RIBA, Architectural Keywords (1982)
mailbox............	[VP]
.................	Chenhall, Revised Nomenclature (1988)
letter-box............	[VP]
.................	Getty Vocabulary Program rules
letter boxes............	[VP]
.................	Webster's Third New International Dictionary (1961)
.................	Random House Dictionary of the English Language (1987)
mail-boxes............	[VP]
.................	RIBA, Architectural Keywords (1982)
mail boxes............	[VP]
.................	Standard Industrial Classification Manual (1987)
brievenbussen............	[Bureau AAT]
.................	AAT-Ned (1994-)
brievenbus............	[Bureau AAT]
.................	AAT-Ned (1994-)
boîtes aux lettres............	[CHIN]
.................	CHIN database
boîte aux lettres............	[VP]
.................	CHIN database
buzones............	[CDBP-DIBAM]
.................	Comité, Plural del término en singular
buzón............	[CDBP-DIBAM]
.................	Moliner, Diccionario de uso del español (2004) I:433
Subject:............	[Bureau AAT]
.................	Chenhall, Revised Nomenclature (1988) box, letter
.................	CHIN database
.................	Van Dale groot woordenboek (1994)

Getty AAT: 300003853 Getty AAT: http://www.getty.edu/vow/AATFullDisplay?find=costume&logic=AND¬e=&subjectid=300003853
聯合目錄： 郵筒 、郵箱 、yu t'ung 、yóu tǒng 、you tong 、mailboxes 、letter-boxes 、mailbox 、letter-box 、letter boxes 、mail-boxes 、mail boxes 、brievenbussen 、brievenbus 、boîtes aux lettres 、boîte aux lettres 、buzones 、buzón