[Hidden-tech] DKIM and SPF issues

[Robert Heller]

Right.  

What you need are a TXT SPF record (for each domain):

<yourdomain.com> TXT "v=spf1 a:<your outbound mail server> mx ~all" 

Then you need a DKIM record (for each domain):

<keyname>._domainkey.<yourdomain.com> TXT "v=DKIM1; k=rsa; "p=<publickey>"

(You do name a DKIM signing deamon installed on your server?  Eg OpenDKIM or 
something similar.)

It is not needed, but could be useful to have a DMARC record as well:

_dmarc.<yourdomain.com> TXT "v=DMARC1;p=none;sp=none;pct=100;adkim=r;aspf=r;fo=1;ri=86400;rua=mailto:someone@<yourdomain.com>" 


OH, important: make sure there is a reverse DNS record for your outbound mail
server and make sure that your outbound mail server sends the correct HELO
message. Most MTAs will reject connections from servers that they cannot get a
valid hostname for AND/OR if the HELO name does not match that hostname.


At Mon, 10 Jul 2023 12:53:07 -0400 rich at tnrglobal.com wrote:

> 
> there is one trick to this - since there 3 different id records that 
> could be the issue, you could do all three which might solve it.
> 
> Better is getting someone whose email bounced to send you the bounce -- 
> the trick is that you need the whole bounce, that not everyone even know 
> how to get
> AND not all senders bounce - it tends to be specific SMTP sending 
> domains - my experience has been older ones like yahoo or aol
> 
> Aside from that- those directions are pretty good - you just have to be 
> fairly sure which of your domains are bouncing which sending domains
> 
> Rich
> 
> On 7/10/2023 12:16 PM, Max Hartshorne via Hidden-discuss wrote:
> >
> > I have a huge issue in my Rackspace provided email service where 
> > replies to people who contact me get sent back as undeliverable. I was 
> > told it was because we have to insert code for DKIM and SPF in our 
> > nameservers. Can anyone here help me with this?
> >
> > https://docs.rackspace.com/support/how-to/enable-dkim-in-the-cloud-office-control-panel/
> >
> > -----------------------
> >
> > Max Hartshorne
> >
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> >
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> >
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> >
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