Benny Pedersen wrote:
> On Tue, May 6, 2008 23:02, Stefan Jakobs wrote:
>
>
>> Yes, that's a possibility, but I can not do that. At least not in the near
>> future. Any other ideas?
>>
>
> depends, but i like to know why spf can't work for you ?
>

I don't speak for OP, but here is an example:

I want to be able to also send mail via my ISP (free.fr) using my own
email address, and since my ISP doesn't publish SPF records nor a list
of official outgoing servers, I can't afford to guess them (if one of
the authorized IP is later allocated to a spammer, this may ruin my
domain reputation. and if a new outgoing server is added, some servers
may block may mail).

Of course, I won't use a +all, because this is generally a sign spam (at
least this is how it is considered).

Now, OP can use DKIM, which doesn't interfere with relaying.