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I frequently have to remind my members not to post their e-mails due to spam bots. One of them told me he doesn't care about that since his spam filter is good enough. If I allow him to do that, are there disadvantages to my website?

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A small one.

Some spammers grab email address and domains to forge From: addresses. If this user's email is public, that might increase the odds that a spammer will forge with it, pretending to be sending email from your domain even though the spam is actually coming from someplace else. In which case, you might notice a slight uptick in warning notices to your maildaemon account, undeliverable email and the like. I presume you already receive a high volume of these warnings and are already filtering them appropriately.

Other than that, I can't imagine any possible downsides.

Further, the user is right, if you have a good spam filter and know enough not to fall for a phishing attack, the risk of publishing your email address are minimal.

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E-mail address is not only an e-mail box. In many cases it's also:

  • login name
  • password retrieval channel

And user login names enumeration is a threat.

  • Excuse me but that doesn't answer the question. – Renan Aug 12 '14 at 15:06

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