On 1/29/11 11:39 AM, sunhux G wrote:
There's only 5 mailboxes (ie a...@mydomain.com
<mailto:a...@mydomain.com>, b...@mydomain.com <mailto:b...@mydomain.com>,
..., e...@mydomain.com <mailto:e...@mydomain.com>) that I'm hosting &
it's using postfix.
The above 5 mailboxes only receives emails from 6 external domain
ie these 5 mailboxes don't send emails out.
Does the above describe it?
Yes.
You can easily achieve this with a combination of check_sender_access
and creating the 5 mailboxes locally; set mydestination to mydomain.com.
You can use the local aliases file to alias away any other (system)
accounts so they can't receive mail.
>It is also surprising that you are trying to discover this unilaterally,
>rather in coordination with the administrators of these domains.
Someone suggested to me to use www.mxtoolbox.com
<http://www.mxtoolbox.com/>, key in
the domains (there's about 6 of them only) & the above site will
provide me all the email/SMTP servers of those domains. Isn't
this sufficient or there's flaws with this?
As has already been pointed out, there are many ways you can get mail
for your destinations from those 6 domains where the mail did not come
directly from any listed mail servers for those 6 domains.
Nor is it a given that a listed MX will SEND you mail; this is in fact
an erroneous assumption in theory.
MX records are for RECEIVING mail only.
I still need to clarify the following doubt:
> 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?
It could come from anywhere.
Just put those domains in a sender access map.
--
J.
