Mark Lloyd wrote:
On 10/14/19 9:27 AM, J. P. Gilliver (John) wrote:

[snip]

A couple of minor netiquette matters: when you send someone an email as
well as posting to a newsgroup, it's considered polite to indicate
you're doing so - usually at the top of your post/email, such as by
saying "(posted and emailed)". This is because lots of people read their
email first, and reply to emails; if they then find the same thing has
been posted, they find themselves having to say the same thing again.

People doing that inappropriately (and not indicating it) is one reason
I stopped putting a valid email address in newsgroup postings.

On usenet, I use addresses ending in .invalid so its obvious its not a
real address.

Not only is it obvious, but it's the only proper/standard way to do
it, as .invalid is a standard-defined [1] top level domain (TLD), which
is guaranteed to never be used.

RFC-compliant 'mailers' (Mail User Agent (MUA)) will not even try to
send a message to an address with an .invalid TLD.

[1] RFC 2606 "Reserved Top Level DNS Names"
http://www.ietf.org/rfc/rfc2606.txt?number=2606