Is it correct for ISPs to ban their users from using an authenticated
SMPT server outside of their network?
Absolutely, YES!
I think you got it backwards. The whole purpose of offering SMTP AUTH is to
provide a means to allow relay from *outside* your network. Relays from
within your own network should simply be whitelisted by IP address/subnet;
like:
Perhaps so... perhaps so.
I read "authenticated SMTP server" to mean an smtp server outside their local
ISP's
network that was one that they were authorized to use. Such as a company
mailserver, or a server for your webhost.
I would indeed NOT require that my customers on my network have to authenticate
to send thru my mailserver. I am just a small ISP, but that would introduce a
lot of
service calls. However, for customers that are outside my network, I would
indeed
want them to be able to authenticate and send- currently done by 'pop3 before
smtp'.
This method works well so far.
John Chapman
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