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

[Noel Butler]

Andrew,

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

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 
surely.

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.

Cheers

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.

-- 
Regards,
Noel Butlerimplimentation

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