![]() ![]() Octets (including the punctuation and element separators).Īs forward-path must include the angle brackets, only 254 characters are left for the email address. The maximum total length of a reverse-path or forward-path is 256 The maximum total length of a user name or other local-part is 64 (*) The special limitation for email address length is a result of RFC 5321 4.5.3.1 and 4.1.2: 4.5.3.1.1. (63-3)/2 = 30 levels after TLD, if you wish to use SSL/TLS.Īnd yes, is in a valid email address format.(253-3)/2 = 125 levels after TLD for theoretically longest (not so useful) hostname.and every part of the hostname must be at least one character long, the space left for additional dots i.e. Some systems and TLS/SSL limits FQDN to 64 bytes and FQDN in emails should not exceed(*) 245 or 221 or 189 bytes depending on the maximum user name length (8, 32 or 64).Īs TLD usually takes at least 2 characters and. However, a RFC1034 compliant hostname can only be 255 bytes long, leaving 253 bytes for a fully qualified domain name FQDN in DNS. There are no direct limits on how many levels i.e. ![]()
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