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Your Questions Answered: Deliverability 101 Power-Up 1/28/2020

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3 comments

  • Simon Baker

    The use case you gave for 'send over time' was for when delivering large volumes of emails to the same company. My question is does Act-ON send over time intelligently split emails to the same domain over the whole time period otherwise it's kind of useless in that scenario.

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  • Simon Baker

    I've read conflicting information on the use of SPF & DKIM in relation to emailing with a sub-domain from address e.g. info@mail.abc-company.com.  Do you need to set up SPF and DKIM at the root domain level, the sub-domain level or both?

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  • Wael Elasady

    Hi Simon, 

    WIth regards to your first question.  No Act-On does not split emails to the same domain over the whole time.  So if you have a very large send to the same domain and are worried about Rate Limiting I would suggesting splitting the lists using our segmentation feature. 

    SPF should be setup on your Envelope Domain also known as your sender domain.   If your Envelope Domain is a sub-domain then the SPF record should be added there. If your Envelope Domain is on the root domain then your SPF entry should be entered there.  In short, SPF will not pass from root to subdomain and back, you should set the SPF record to the domain being used for your Envelope Domain.  If you are using an ESP like Act-On the Envelope Domain is typically a sub-domain created explicitly for this purposes.  You can add SPF to your root level domain you use in the From field of emails that is visible to end users but while this wont hurt, this actually is not neccassery. 

    DKIM should be setup on your From Address Domain, which is the domain that is visible to your end users in the from field.  With DKIM, unlike SPF, your DKIM will not fail if it doesn't match the From address domain but if the domain on which you are signing DKIM does not match the From Address domain this may not provide the recipient ISPs with much insight on determining if the entity sending the mail is authorized to do so.  So in this case if you use multiple subdomains for different streams of sending and you set DKIM on the root,  this is fine and gives the ISP a signal that you are an authorized sender (please note this will not be the case in the opposite direction).  The other thing to think about in this type of use case is reputation, DKIM plays a big role at major ISPs in determining how you establish a reputation.  So if you want seperate reputations for each sub-domain or stream then you should setup DKIM on each individual Sub-domain otherwise the reputation you establish will be at the root level and less seperted by stream.  

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