stpeters at netheaven
Dec 1, 2006, 1:20 PM
Post #26 of 29
(5620 views)
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Re: private relay ... could i use srs to avoid spf fail?
[In reply to]
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wayne writes:
> In <17776.15222.910009.720786 [at] saint> "Dick St.Peters" <stpeters [at] netheaven> writes:
>
> > If you use SRS to reject bogus DSNs, you will also reject return
> > receipts from Outlook (and probably Outlook Express) users.
>
> Are you saying that Outlook doesn't send DSNs to the 2821.MAILFROM, as
> RFC3834 says to? If so, what does it send it to instead?
Return receipts and DSNs aren't the same thing.
I presume Outlook sends its return receipts to the 2822.FROM, but for
all I know it could even send them to an address from the Outlook
user's Address Book.
Most of my users using Outlook are using versions dating to well
before RFC3834 was published. Outlook's return receipts aren't quite
automatic responses anyway, as Outlook lets the user add a message to
the return receipt. I think it gives the user the option of not
sending the receipt also.
> > Rejecting non-SRS DSNs also rejects responses from some
> > autoresponders. While many people might think of this as a Good
> > Thing, I have users who consider out-of-office notifications
> > valuable.
>
> Again, it sounds like those systems are broken by not sending to the
> 2821.MAILFROM.
>
>
> > Rejecting non-SRS DSNs naively also rejects postmaster-verification
> > callbacks, causing some sites to reject your mail.
>
> Again, those systems sound broken. If a call-back verification is
> checking the 2821.MAILFROM, it should give use a NULL MAIL FROM on the
> check (and a RCPT TO do the original 2821.MAILFROM). If the call-back
> verification is using something like the 2822.From: header, it should
> use something like <postmaster [at] domain-using-cbv> as the
> 2821.MAILFROM.
As an email administrator a lot of what I do is compensate for the
behaviors of other mail systems (and of MUAs like Outlook) in order to
get my users' mail through. I can't change what other people do, so I
deal with it.
--
Dick St.Peters, stpeters [at] NetHeaven
Gatekeeper, NetHeaven, Saratoga Springs, NY
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