username/uid restrictions

Tim ignored_mailbox at
Fri Dec 2 12:27:46 UTC 2005

On Fri, 2005-12-02 at 10:31 +0000, T. Horsnell wrote:
> The thing that concerns me more, is the plethora of reserved
> usernames. There seems to be no rule to distinguish a reserved
> username (presumably the list in the RHEL sysadmin guide is
> going to grow) and its only a matter of time before some
> newly allocated name collides with one which has been given to
> a user. In fact, I cant find anywhere what the rules are for
> usernames. Character-set? How many chars?
> Pity that reserved names arent systematic in some way (like
> always starting with sys_ or somesuch).

I suppose your best bet is to use real human name derived usernames,
rather than nicknames, placenames, or technical-sounding names.

The other obvious solution is run a separate box for your mail service,
that's not going to have other services running on it, and carry on
using what already works fine for you.

Don't send private replies to my address, the mailbox is ignored.
I read messages from the public lists.

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