Re: Basic question...

2019-06-10 Thread Wietse Venema
Michael Segel: > All, sorry for posting a basic question? > > I?ve got an old box running as my mail server. > I want to bring up Postfix on my new box and not only have it as my secondary > MX server, I? like to have my mail from the first server replicated to the > second server. > > What

Re: basic question: permit SMTP from recipients or whitelist ?

2011-01-29 Thread sunhux G
Thanks very much Victor & Jeroen. As I'm a newbie/beginner, guess I'll stick to "sender access map" & see if there are many spoofed emails. I have a lot to learn from this list. Thanks U On Sat, Jan 29, 2011 at 8:35 PM, Victor Duchovni < victor.ducho...@morganstanley.com> wrote: > On Sat, Jan

Re: basic question: permit SMTP from recipients or whitelist ?

2011-01-29 Thread Victor Duchovni
On Sat, Jan 29, 2011 at 12:36:35PM +0100, Jeroen Geilman wrote: > Just put those domains in a sender access map. This is easily spoofed, and the OP has stated a desire to not allow spoofed email. Hence some sort of authentication (SPF, DKIM, TLS client certs, bilaterally agreed list of client IPs

Re: basic question: permit SMTP from recipients or whitelist ?

2011-01-29 Thread Jeroen Geilman
On 1/29/11 11:39 AM, sunhux G wrote: There's only 5 mailboxes (ie a...@mydomain.com , b...@mydomain.com , ..., e...@mydomain.com ) that I'm hosting & it's using postfix. The above 5 mailboxes only receives emails fr

Re: basic question: permit SMTP from recipients or whitelist ?

2011-01-29 Thread sunhux G
There's only 5 mailboxes (ie a...@mydomain.com, b...@mydomain.com, ..., 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? >It is also surprising that

Re: basic question: permit SMTP from recipients or whitelist ?

2011-01-28 Thread Victor Duchovni
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

Re: basic question: permit SMTP from recipients or whitelist ?

2011-01-28 Thread sunhux G
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? As for the externa

Re: basic question: permit SMTP from recipients or whitelist ?

2011-01-28 Thread sunhux G
>>b) how do I determine the source IP address of those domains >Email can come from anywhere, via multiple routes that do not > have any direct relation with the sending domain. I thought if I entered the domain name, say dsta.gov.sg into www.mxtoolbox.com, it would list out all the smtp/mail se

Re: basic question: permit SMTP from recipients or whitelist ?

2011-01-27 Thread Victor Duchovni
On Thu, Jan 27, 2011 at 02:11:02PM +0800, sunhux G wrote: > I'm setting up a postfix mailserver. Only a handful (of about 6 domains , > ie x...@dsta.gov.sg , x...@starnet.gov.sg, x...@ncssmsonbehalf.com.sg , > x...@accenture.com ) are allowed to email to my postfix server. When you say that on

Re: basic question: permit SMTP from recipients or whitelist ?

2011-01-27 Thread Jeroen Geilman
On 1/27/11 7:11 AM, sunhux G wrote: I'm setting up a postfix mailserver. Only a handful (of about 6 domains , ie x...@dsta.gov.sg , x...@starnet.gov.sg , x...@ncssmsonbehalf.com.sg , x...@accenture.com