[Exim] max_username_length or max_user_name_length ?

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In exim document, it wrote "max_user_name_length".
But in exim 3.13 source code, it is "max_username_length".

Which one is correct ? Thank you. :)

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Ching-Wei LIN
cwlin@???. http://cwlin.seed.net.tw
SEEDNet Senior System Administrator / System Architect
Taipei, Taiwan.