[AusNOG] Anyone knowledgeable from Mimecast here who can contact me off list?

Noel Butler noel.butler at ausics.net
Tue Oct 19 13:10:32 EST 2021


This is likely off topic for this list, but anyway, since I live on the 

By my count there is only 3 not 10 mechanism lookups (and show me an 
implementation that actually stops at 10), I'm not so sure they should 
be counting the includes includes/a/aaaa's either, only the include 
itself, as includes are typically out of your control (it has been a 
very long time since I read that RFC so may be wrong)

Anyway, if that was the issue, it would have surfaced long before now 

If I was a betting man, I'd say DNS caching is the cause, if I was a 
betting man, I'd also be betting someone didnt drop a TTL when preparing 
for the change, so will have to wait till records refresh.

Of course all this is assumption because OP never posted the actual 
error message.


On 19/10/2021 09:07, Andrew Oakeley wrote:

> Hi,
> If I was you; I would start by fixing your SPF.
> This will show you the errors
> https://mxtoolbox.com/SuperTool.aspx?action=spf%3aheartland.com.au&run=toolpage
> Andrew
> From: AusNOG <ausnog-bounces at lists.ausnog.net> On Behalf Of Christopher 
> Scholfield
> Sent: Tuesday, 19 October 2021 7:04 AM
> To: 'AusNOG Mailing List' <ausnog at ausnog.net>
> Subject: [AusNOG] Anyone knowledgeable from Mimecast here who can 
> contact me off list?
> Yesterday we changed mail filters, Mimecast is the only email provider 
> that has been rejecting our emails due to SPF problems for the last 20 
> odd hours.  Mimecast technical support has told me their customers who 
> aren't getting our emails need to contact them so their tech support 
> can explain how to bypass their mail filters for our mail server.
> I'd rather work with someone at Mimecast to resolve the cause of the 
> problem.

Noel Butlerimplimentation

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