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    <p>The domain part (after the last @), is a series of string labels divided by a dot.</p> <p>Each label is a string of 1 to 63 octets consisting of A-Z, a-z 0-9 or hyphen (-)</p> <p>The maximum size of the domain is 255 octets.</p> <p>To be compatible with arpanet, each label must start with a letter and end with a letter or digit but some TLD:s now allows an all numeric domain, like 0.nu</p> <p>Note that the TLD is allowed to be 63 octets. Very many scrips wrongly restricts it to 2-3 octets making domain.name invalid.</p> <p>Example?</p> <p>abcdefghijklmnopqrstuvwxyz.ABCDEFGHIJKLMNOPQRSTUVWXYZ.!#$%&amp;'+-/=.?^`{|}~@ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz-0123456789.a.b.c.d.e.f.g.h.i.j.k.l.m.n.o.p.q.r.s.t.u.v.w.x.y.z.A.B.C.D.E.F.G.H.I.J.K.L.M.N.O.P.Q.R.S.T.U.V.W.X.Y.Z.0.1.2.3.4.5.6.7.8.9.a-z.A-Z.0-9.a0.b1.c2.d3.e4.f5.g6.h7.i8.j9.K0.L1.M2.N3.O.domain.name</p> <p>(and no, it isn't registered)</p> <p>Update: With IDNA almost <strong>everything</strong> is possible:</p> <ul> <li>punnycode@XN--0ZWM56D.XN--HGBK6AJ7F53BBA</li> <li>idna_in_clear(?)_text@例子.测试.مثال.آزمایشی</li> </ul> <p>See also: </p> <p><a href="https://stackoverflow.com/questions/3232/how-far-should-one-take-e-mail-address-validation">https://stackoverflow.com/questions/3232/how-far-should-one-take-e-mail-address-validation</a></p> <p><a href="http://www.leshazlewood.com/?p=5" rel="nofollow noreferrer">http://www.leshazlewood.com/?p=5</a></p> <p><strong>Update:</strong> Bobince suggested to test for a dot in the domain name.</p> <p><strong>Summary</strong>: Only test for @ and a dot in the domain part and then send a confirmation email.</p> <p>Here is an example that test for @ and dot:</p> <ul> <li>There must be at least one @</li> <li>There must be at least one char in the local part ( pos > 0)</li> <li>There must be at least one dot in the domain part</li> <li>The domain part must be at lest 4 characters</li> </ul> <p>Here is a simple one:</p> <pre><code>function isEmail(address) { var pos = address.lastIndexOf("@"); return pos &gt; 0 &amp;&amp; (address.lastIndexOf(".") &gt; pos) &amp;&amp; (address.length - pos &gt; 4); } </code></pre> <p>Or a function that returns the local and domain part in an object ( if you want to process it even further, for example convert it to punycode) </p> <pre><code>function isEmail(address) { var pos = address.lastIndexOf("@"); return pos &gt; 0 &amp;&amp; (address.lastIndexOf(".") &gt; pos) &amp;&amp; (address.length - pos &gt; 4) ? { local:address.substr(0,pos &lt; 0 ? 0 : pos), domain:address.substr(pos+1) }: false; } </code></pre>
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    1. POlist of email addresses that can be used to test a javascript validation script
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    1. COTesting for ‘.’ is also useful to catch the people who just put ‘hotmail’ with no TLD. We can, I think, safely assume no-one will be filling in an address @ a TLD itself.
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    2. COI'm not sure if it is legal or not to have an address at the TLD. Technically it should be possible, but I am not aware of any that have it.
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