![]() The domain name part of an email address has to conform to strict guidelines: it must match the requirements for aĬonsisting of letters, digits, hyphens and dots. Use the same password that you use while logging into your email inbox. Hotmail, for example, refuses to send mail to any address containing any of the following standards-permissible characters: ![]() Legitimate addresses as invalid and fail to handle mail to these addresses. Contrary to the relevant standards, some defective systems treat certain Systems that send mail must be capable of handling outgoing mail for all valid addresses. Organizations are free to restrict the forms of their own email addresses as desired, e.g.,įor example, only allows creation of email addresses using alphanumerics, dot (. This is the correct equivalent value for CRLF, which the FAQ that timglabisch linked to says is correct. However most organizations treat uppercase and lowercase letters as equivalent, and also do not allow use of the technically valid characters JHeimbach The EOL constant in Zend\Mail\Protocol\AbstractProtocol is set to '\r ', which Zend\Mail\Protocol\Smtp inherits from. Technically all other local-partsĪre case sensitive, therefore and specify different mailboxes. The local-part "postmaster" is treated specially - it is case-insensitive, and should be forwarded to the server's administrator. Warns that " a host that expects to receive mail SHOULD avoid defining mailboxes where the Local-part requires (or uses) the Quoted-string form". Quoted strings and characters however, are not commonly used. Quotation mark " (ASCII: 32, 92, 34)) must also be preceded by a backslashĪ quoted string may exist as a dot separated entity within the local-part, or it may exist when the outermost quotes are the outermost characters of the local-part The restrictions for special characters are that they must only be used when contained between quotation marks, and that 3 of them (The Special characters are allowed with restrictions.Provided also that it does not appear two or more times consecutively (e.g. (dot, period, full stop) (ASCII: 46) provided that it is not the first or last character, and Uppercase and lowercase English letters (a–z, A–Z) (ASCII: 65-90, 97-122).The local-part of the email address may use any of these The formal definitions are in RFC 5322 (sections 3.2.3Īnd 3.4.1) and RFC 5321 - with a more readable form given in Maximum of 253 characters - but the maximum 256 characters length of a forward or reverse path restricts the entire email address to be no more than 254 characters. Hi The format of email addresses where the local-part may be up to 64 characters long and the
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