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smtp - DKIM for email through Google Apps domain with external outbound relay

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I'd like to enable the new href="http://en.wikipedia.org/wiki/DomainKeys_Identified_Mail" rel="nofollow
noreferrer">Domain Keys DKIM email authentication feature for a href="http://www.google.com/support/a/bin/answer.py?answer=180504" rel="nofollow
noreferrer">domain hosted in Google
Apps.



Some of my users use an external
SMTP gateway (such that when they send email, it doesn't go through smtp.gmail.com).




I have an href="http://en.wikipedia.org/wiki/Sender_Policy_Framework" rel="nofollow
noreferrer">SPF record configured for the domain, and this allows the
external SMTP gateways as valid SMTP hosts. (I realise SPF is different to
DKIM)



Will enabling DKIM adversely affect the
external gateway email? eg. Are the externally sent emails at risk of being marked as
spam because they would not have the DKIM signature, or will DKIM only positively
benefit emails sent through Google's SMTP server?



Answer




Your users can use an external SMTP server. But of course, their emails will
have a worse reputation, compared to those directly sent from Google's server, and for
two reasons :




  • The first
    one is that they won't be signed by DKIM (luckily the server is declared in the SPF
    record)

  • You'll send mails from a server that is not
    declared as a MX for the
    domain




We're
just talking here about email reputation (ie the spam score). But don't worry it will
work : You may just sometimes have mails seen as spam, in general with big companies
with high spam protections (AOL, Yahoo, Gmail, Hotmail, ...).



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