Thought I would point out as well..
This message was sent via Outlook to the list, and Outlook already
marked your message as spam, which many other filtering systems will
honour. That header remained intact while being processed by the
mailing list software at mailop.org.
x-forefront-antispam-report: SFV:SPM;...
And to the original problem, you might like to look at standard 'Best
Practices for Email Operators'..
PTR:ip-103-219-120-34.stcolumba.customer-wan.caznet.com.au
But in this case, it depends on how you expect that relay to function.
If you configure the Postfix relay to use SMTP authentication through an
email account at 'caznet.com.au', which is your provider correct? then
you won't have any problems. (Or use any SMTP provider where the client
has an account)
However, if you want your relay to act as a true MTA, then you will have
to conform to Best Practices.. eg change the PTR to be something like
'server.customerdomain.com'. (The domain for the responsible party for
the emails)
That default PTR you were assigned will probably be treated as an
'unconfigured' source/device, and not an MTA by most spam methods to
some extent or another..
But given that your corp ip was flagged, as well as the IP in question,
it suggests that the reputation is either with your company, your
network, or your domain, and not just that one IP Address.
On 17-11-23 07:59 PM, Shane Clay via mailop wrote:
I’d considered that.
This server has been around a long time (and the rdns hasn’t changed)
and the problem has only just come up. If it is the rdns, it’s a new
problem.
Do the HELO and RDNS have to match to pass spam detection? I would have
thought that a valid, matching SPF record and the fact that the IP
actually has a PTR etc would be sufficient.
Shane
*From:*Postmaster [mailto:i...@mailvue.com]
*Sent:* Friday, 24 November 2017 2:23 PM
*To:* Shane Clay <sh...@caznet.com.au>
*Subject:* Re: [mailop] Office 365 - Emails marked as not passing fraud
detection
Could it be the rdns?
PTR:ip-103-219-120-34.stcolumba.customer-wan.caznet.com.au
<http://stcolumba.customer-wan.caznet.com.au>;
On Nov 23, 2017, at 8:31 PM, Shane Clay via mailop
<mailop@mailop.org <mailto:mailop@mailop.org>> wrote:
PTR:ip-103-219-120-34.stcolumba.customer-wan.caznet.com.au
<http://stcolumba.customer-wan.caznet.com.au/>;
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