NethServer 6 » Nethgui

Validate an email address according to the following rules:

1. An email address is composed of a local and a domain part, in the form localpart@domainpart
2. local part has a length between 1 and 64 characters
3. local part must be a sequence of characters in the ranges A-Z a-z 0-9 or the symbols ._-.
4. the local part must start with a letter, and cannot contain two or more consecutive dots ..
5. domain part is a valid hostname
6. the entire email address length must be less or equal to 254 characters

Those rules allow a subset of strings considered valid email addresses by RFC5322