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  • What do you mean by "optimal"? What are you trying to "optimize"? Commented Jul 29, 2009 at 10:34
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    @S.Lott: I want build a secure system. The increase in user's input increases the risk that they can run codes in the database. --- I see optimal as the best way to have a secure system. Commented Jul 29, 2009 at 10:40
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    Well, while there is security considerations in not making something unbounded, adhearing to the standards will always make the most sense. Following what is "common" or "optimal" will likely introduce security issues then reduce them. Commented Jul 29, 2009 at 11:39
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    This question on StackOverflow suggests that the max length is now 254 characters including the "@" sign: stackoverflow.com/questions/386294/… Commented Feb 11, 2010 at 16:35
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    Here's a related post on email length from @DominicSayers, with a really thorough answer: stackoverflow.com/a/574698/361842 Commented Jul 28, 2017 at 9:25