To get rid of the "via" and "on behalf of" headers in Gmail and Outlook, do I need to set both the DKIM and the SPF records, or are DKIM records enough?
We recently changed our SMTP provider from AuthSMTP to Mandrill. By default Mandrill does bounce handling itself, so the Return-Path
is set to mandrillapp.com
. In the SPF check I saw that it checks the SPF records of mandrillapp.com
instead of ourdomain.com
, probably because of this Return-Path
. For DKIM it checks ourdomain.com
.
During testing I noticed that the "via header" was already gone in Gmail when only the DKIM record was added, but not the SPF record yet. So this makes me think only adding DKIM is enough for this header?
The actual reason I'm asking this is that we are temporarily running against the 10 DNS lookup limit for SPF, because we are trying out different tools, so if I can continue without completely correct SPF records now (ending with ~all
) that would be handy.