Julian Field mailscanner at ecs.soton.ac.uk
Tue Aug 10 18:19:01 IST 2004

At 18:04 10/08/2004, you wrote:
>One of the beauties of SPF as I 'sort of' understand it, is the DNS
>record is checked first and only if it passes is the server opened to
>receive that email (seems like MailScanner is the front line and that
>would be the place to do this?). I'm not sure about exactly what happens
>and when, with MailScanner, but I would like to know that the first
>check made is at the DNS level and only then receive the email and put
>it through whatever paces are in place, AV, AS and so forth. This would
>be a huge reduction in server loads. Why do all that processing if only
>then at the MTA level, does the email get rejected (server refuses to
>download it)?
>Would this be the case with the current MailScanner? I am running RHEL
>and sendmail. I will be adding the SPF sendmail patch at an appropriate

 From your description above, you want to do your SPF checks at the MTA
level, so use sendmail to do it, not MailScanner.
Julian Field
Professional Support Services at www.MailScanner.biz
MailScanner thanks transtec Computers for their support
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