Localpart Characters

This table lists the characters allowed in the localpart of an SMTP mail address.

The characters marked with a are allowed in atoms. Normally the localpart consists of atoms optionally separated by dots.

The characters marked with " are only allowed if the whole localpart is enclosed in double quotes. The characters marked with \ must additionally be escaped by preceding them with a backslash.

(Note: RFC 5322 addresses are a superset of RFC 5321 addresses)

"	0020	32	000040		SPACE
a	0021	33	000041	!	EXCLAMATION MARK
\	0022	34	000042	"	QUOTATION MARK
a	0023	35	000043	#	NUMBER SIGN
a	0024	36	000044	$	DOLLAR SIGN
a	0025	37	000045	%	PERCENT SIGN
a	0026	38	000046	&	AMPERSAND
a	0027	39	000047	'	APOSTROPHE
"	0028	40	000050	(	LEFT PARENTHESIS
"	0029	41	000051	)	RIGHT PARENTHESIS
a	002a	42	000052	*	ASTERISK
a	002b	43	000053	+	PLUS SIGN
"	002c	44	000054	,	COMMA
a	002d	45	000055	-	HYPHEN-MINUS
.	002e	46	000056	.	FULL STOP
a	002f	47	000057	/	SOLIDUS
a	0030	48	000060	0	DIGIT ZERO
a	0031	49	000061	1	DIGIT ONE
a	0032	50	000062	2	DIGIT TWO
a	0033	51	000063	3	DIGIT THREE
a	0034	52	000064	4	DIGIT FOUR
a	0035	53	000065	5	DIGIT FIVE
a	0036	54	000066	6	DIGIT SIX
a	0037	55	000067	7	DIGIT SEVEN
a	0038	56	000070	8	DIGIT EIGHT
a	0039	57	000071	9	DIGIT NINE
"	003a	58	000072	:	COLON
"	003b	59	000073	;	SEMICOLON
"	003c	60	000074	<	LESS-THAN SIGN
a	003d	61	000075	=	EQUALS SIGN
"	003e	62	000076	>	GREATER-THAN SIGN
a	003f	63	000077	?	QUESTION MARK
"	0040	64	000100	@	COMMERCIAL AT
a	0041	65	000101	A	LATIN CAPITAL LETTER A
a	0042	66	000102	B	LATIN CAPITAL LETTER B
a	0043	67	000103	C	LATIN CAPITAL LETTER C
a	0044	68	000104	D	LATIN CAPITAL LETTER D
a	0045	69	000105	E	LATIN CAPITAL LETTER E
a	0046	70	000106	F	LATIN CAPITAL LETTER F
a	0047	71	000107	G	LATIN CAPITAL LETTER G
a	0048	72	000110	H	LATIN CAPITAL LETTER H
a	0049	73	000111	I	LATIN CAPITAL LETTER I
a	004a	74	000112	J	LATIN CAPITAL LETTER J
a	004b	75	000113	K	LATIN CAPITAL LETTER K
a	004c	76	000114	L	LATIN CAPITAL LETTER L
a	004d	77	000115	M	LATIN CAPITAL LETTER M
a	004e	78	000116	N	LATIN CAPITAL LETTER N
a	004f	79	000117	O	LATIN CAPITAL LETTER O
a	0050	80	000120	P	LATIN CAPITAL LETTER P
a	0051	81	000121	Q	LATIN CAPITAL LETTER Q
a	0052	82	000122	R	LATIN CAPITAL LETTER R
a	0053	83	000123	S	LATIN CAPITAL LETTER S
a	0054	84	000124	T	LATIN CAPITAL LETTER T
a	0055	85	000125	U	LATIN CAPITAL LETTER U
a	0056	86	000126	V	LATIN CAPITAL LETTER V
a	0057	87	000127	W	LATIN CAPITAL LETTER W
a	0058	88	000130	X	LATIN CAPITAL LETTER X
a	0059	89	000131	Y	LATIN CAPITAL LETTER Y
a	005a	90	000132	Z	LATIN CAPITAL LETTER Z
"	005b	91	000133	[	LEFT SQUARE BRACKET
\	005c	92	000134	\	REVERSE SOLIDUS
"	005d	93	000135	]	RIGHT SQUARE BRACKET
a	005e	94	000136	^	CIRCUMFLEX ACCENT
a	005f	95	000137	_	LOW LINE
a	0060	96	000140	`	GRAVE ACCENT
a	0061	97	000141	a	LATIN SMALL LETTER A
a	0062	98	000142	b	LATIN SMALL LETTER B
a	0063	99	000143	c	LATIN SMALL LETTER C
a	0064	100	000144	d	LATIN SMALL LETTER D
a	0065	101	000145	e	LATIN SMALL LETTER E
a	0066	102	000146	f	LATIN SMALL LETTER F
a	0067	103	000147	g	LATIN SMALL LETTER G
a	0068	104	000150	h	LATIN SMALL LETTER H
a	0069	105	000151	i	LATIN SMALL LETTER I
a	006a	106	000152	j	LATIN SMALL LETTER J
a	006b	107	000153	k	LATIN SMALL LETTER K
a	006c	108	000154	l	LATIN SMALL LETTER L
a	006d	109	000155	m	LATIN SMALL LETTER M
a	006e	110	000156	n	LATIN SMALL LETTER N
a	006f	111	000157	o	LATIN SMALL LETTER O
a	0070	112	000160	p	LATIN SMALL LETTER P
a	0071	113	000161	q	LATIN SMALL LETTER Q
a	0072	114	000162	r	LATIN SMALL LETTER R
a	0073	115	000163	s	LATIN SMALL LETTER S
a	0074	116	000164	t	LATIN SMALL LETTER T
a	0075	117	000165	u	LATIN SMALL LETTER U
a	0076	118	000166	v	LATIN SMALL LETTER V
a	0077	119	000167	w	LATIN SMALL LETTER W
a	0078	120	000170	x	LATIN SMALL LETTER X
a	0079	121	000171	y	LATIN SMALL LETTER Y
a	007a	122	000172	z	LATIN SMALL LETTER Z
a	007b	123	000173	{	LEFT CURLY BRACKET
a	007c	124	000174	|	VERTICAL LINE
a	007d	125	000175	}	RIGHT CURLY BRACKET
a	007e	126	000176	~	TILDE