Re: [exim] Exim and SPF

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Autor: Mike Cardwell
Datum:  
To: exim-users
Betreff: Re: [exim] Exim and SPF
Ian Eiloart wrote:

>> Is anyone using SPF in Exim? I'm still trying to figure out a use for it.
>
> If you do sender address whitelisting, you should insist on an SPF pass
> first. 60% of the email that we deliver today has an SPF pass. Most of the
> rest is from domains without SPF records.


That 60% figure surprised me. Seemed quite high. So I just scanned my
mail logs for unique sender envelope domains of mail classified as ham,
for the past 10 days. I then did TXT record lookups on the lot of them.

146 out of 242 of them have SPF records. Which is *exactly* 60% here
too... I repeated the experiment for the past 100 days and it was 51%.
SPF is more widely adopted than I realised...

--
Mike Cardwell - IT Consultant and LAMP developer
Cardwell IT Ltd. (UK Reg'd Company #06920226) http://cardwellit.com/
Technical Blog: https://secure.grepular.com/blog/