Mailscanner, forwarding and SPF

[Nerk Nerk]

Same thing happens with DKIM/DMARC by the way, not just SPF.

2017-02-21 13:15 GMT+01:00 Nerk Nerk <donnerk at gmail.com>:

> Thank you for your answers.
>
> The problem is, that the people that use my filters, don't own the server
> that their email is hosted on. So they can't always decide to turn
> something off.
>
> 2017-02-21 12:56 GMT+01:00 Antony Stone <Antony.Stone at mailscanner.
> open.source.it>:
>
>> On Tuesday 21 February 2017 at 12:48:18, Nerk Nerk wrote:
>>
>> > Dear MailScanner-fanatics,
>> >
>> > Currently I am facing some issues using MailScanner. Mostly, when the
>> > following situation is current:
>> >
>> > - Some domain using SPF, for example Paypal, sends a mail to a domain
>> that
>> > I filter for
>>
>> So, you are the destination of the MX records...
>>
>> > - The domain is filtered through Mailscanner
>> > - The e-mail is forwarded to the destination
>>
>> How does that happen?
>>
>> > - The destination server is not under my control. They do SPF checking
>> and
>> > reject the mail because the sending domain does not list my mailscanner
>> IP
>> > as a valid sender
>> >
>> > Ofcourse I have thought of some solutions:
>> > 1- They need to whitelist the IP of my mailscanner
>>
>> That would be good, considering that they've bought (?) a filtering
>> service
>> from you, and expect mail to pass through your servers on the way to
>> theirs.
>>
>> > 2- They need to turn off the SPF checks at the destination
>>
>> Do they receive any direct (ie: not filtered through your servers) email?
>>
>> > Both solutions however, require actions from a hosting party that I
>> don't
>> > know and that is probably not willing.
>>
>> So, why have they pointed their MX records at your server, if they're not
>> wiling to adjust their server to match this?
>>
>> > A third option:
>> > 3- I need to rewrite the sending domain somehow
>>
>> Yes, like manay mailing lists do.
>>
>> > Has anyone else come across this problem? How did you solve it?
>> >
>> > I am really wondering what solution commercial spam filtering services,
>> > such as SpamExperts for example, are using.
>>
>> I can't speak for them.
>>
>>
>> Antony.
>>
>> --
>> Never automate fully anything that does not have a manual override
>> capability.
>> Never design anything that cannot work under degraded conditions in
>> emergency.
>>
>>                                                    Please reply to the
>> list;
>>                                                          please *don't*
>> CC me.
>>
>>
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>>
>>
>
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