How do I best configure my DNS, DKIM and SPF settings for best delivery of my clients newsletter emails?

They have large-ish client lists and are seeing many fails, bounces and rejections lately. The content is specific to the list and the
clients have all gone through a double-optin process.
Tim YDC SupportStaffAsked:
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Ugo MenaCommented:
How is your DNS and SPF currently setup? Are you using SPF or DKIM currently?

How is your client newsletter being sent?
Ugo MenaCommented:
Are you sending on behalf of another domain and thereby using another domain name attached to the message header?
Tim YDC SupportStaffAuthor Commented:
Thanks for the follow up ultralites (for flying? kewl!)
Yes, have been sending on behalf of two other domains with a dedicated common reply-to: field.

Am trying to be anti-spam compliant but not finding many clearly written references -
current DNS is set like this: (some vitals changed but IN TXT "v=spf1 all"
_dmarc IN TXT "v=DMARC1; p=none;"

Am getting and evaluating the daily reports from other hosts but not quite understanding how to satisfy the DKIM settings or config....and also not found good unconfusing docs.
Thanks in advance for any educational direction.
Ugo MenaCommented:
The include statements within spf need to be on your client's domain, as they are going to include your domain as the "also allowed to send" for their domain.

DKIM is not as widely used but is essentially a digital signature that is attached to the message and verified via DNS and public keys.

Both DNS text records, spf and DNS public key are created by the domain owner and would be supplied to you by them to send email for them.

Do you have the private key for DKIM? Or do you have the ability to create a DNS record at your client's registrar?

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