[CentOS] E-mail advice sought

Sun May 1 03:56:12 UTC 2016
Gordon Messmer <gordon.messmer at gmail.com>

On Sat, Apr 30, 2016 at 12:44 PM, Alice Wonder <alice at domblogger.net> wrote:
> For e-mail sent to people, yes.
> But for what usernames are allowed when creating an account, I don't see why
> blacklisting characters that are not allowed in a username is a standards
> problem.

That's not how the RFC rules are defined.  But, rather than argue that
point at length, I'd point out that Open Group standards for usernames
are simple and will comply with the SMTP RFCs:

That is, [A-Za-z0-9._][A-Za-z0-9._-]