On Fri, Jan 28, 2011 at 11:36:28PM +0800, sunhux G wrote:
> So is it right to say that though I want only a small handful of
> users from certain domains/organizations to send email to me,
> it could be email gateways (or "mail relay servers" ??) that are
> unrelated to those domains/organizations that make Tcp25
> connection to my email server?
You have not described in any way what kind of recipient mailboxes
you hosting, and part of the story is lies in recipient behaviour.
If recipients forward mail received at other mail domains to your domain
for delivery, then you need to consider supporting mail clients that
are handle mail forwarding for those domains or to "encourage" your
recipients to not forward.
You also need to understand whether any of the legitimate sending users
send email via unexpected origin systems:
- Outsourced vendor mailings
- Consumer cloud services that send email (Evite, Newspaper
forward to a friend services, ...)
- ...
It is also surprising that you are trying to discover this unilaterally,
rather in coordination with the administrators of these domains.
> As for the external POP3 clients that connects to my POP3
> server (which runs in the same box as postfix), it makes sense
> to permit on my firewall for those POP3 clients to connect?
POP3 and IMAP are for recipients, not senders, you've not described
the recipient requirements at all.
--
Viktor.
