Request: Please sign this list's messages via DKIM or SPF

Binarus lists at
Mon Apr 4 12:26:41 EDT 2016

On 04.04.2016 18:12, Sebastian Hagedorn via Info-cyrus wrote:
> Personally, I think that's a phenomenally stupid approach. As long as you can't show me an RFC that says you MUST or even SHOULD use SPF or DKIM, you're breaking SMTP.

I think it's a phenomenally intelligent approach. I can't see in which way SMTP is broken by using DKIM or SPF. The DKIM signature is in an additional header (additional headers *are* allowed by the RFCs), and signing and checking usually is done by milters (I am sure that you know them). If a message is rejected by the receiving MTA due to failing SPF or DKIM, the sender will get a DSN (which is perfectly in conformance with the RFCs).

By the way, many people use all sorts of mail filtering and DSNs (and do so since 20 years and more) without an RFC saying they SHOULD or MUST do so. Are all people which use any sort of mail filter breaking SMTP as well?

Could you please give an example of an SMTP RFC which is violated by SPF or DKIM?



>> Due to the exponential increase of spam, we generally have to reject all
>> messages which are not secured by SPF or DKIM, and we know a lot of other
>> people who do the same (by the way, this has proven to be extremely
>> effective in our case). When our MTA encounters such a message, it
>> rejects it and returns a bounce message to the pretended sender,
>> notifying him about the problem.
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