Is there any serious reason not to use symbols in an email address?

Question

My last name is hyphenated. Is there any serious reason why I should not use a - symbol in an email address? e.g. [e-mail]

I ask because I have previously been given [e-mail] and I wondered if this is due to a sensible policy, or an unnecessary one.

Broadening the scope of the question, is there any serious reason not to use any of the permitted symbols in an email address?

Answer 1

I ask because I have previously been given [e-mail] and I wondered if this is due to a sensible policy, or an unnecessary one.

Disallowing hyphens is rather unnecessary. Many email providers (including Hotmail) allow hyphens.

Broadening the scope of the question, is there any serious reason not to use any of the permitted symbols in an email address?

Sadly, yes.

According to the standard, "very.unusual.@.unusual.com"@example.com is a perfectly valid email address (souce).

But not all email clients adhere to the standard. Sending an email to this address is impossible for Windows Mail¹.

Furthermore, many websites "validate" the provided email address in their forms. If your email address contains anything but alphanumeric characters, dots, hyphens and underscores, there's a good chance it won't pass some of those "validations".

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_{¹ Tested with version 6.0.6000.16386}