offtopic: rant about thoughtless enabling DMARC checks [was: Re: Bounces?]

Juri Haberland juri at
Sat Feb 9 21:12:40 EET 2019

On 09/02/2019 19:56, Aki Tuomi via dovecot wrote:
>> On 09 February 2019 at 20:48 Juri Haberland via dovecot < dovecot at 
>> <mailto:dovecot at>> wrote:

>> Most people use OpenDMARC and there are patches to mark certain hosts as
>> mailing lists senders, so it is possible.

> Wonder how many would do this though?

Yeah, unfortunately not enough...

>> And everyone using p=reject should think about it as well - as I said,
>> DMARC does not play well with mailing lists, so setting p=reject on a
>> domain used to participate on mailing lists is not wise, to say the least.
>> You should not follow Yahoo and AOL - you know, why they did it, don't you?

> Unfortunately this is usually required by many common providers such as 
> microsoft and google, otherwise they refuse your mail.

That is definitely not true. They might require you to have DKIM and/or SPF
and maybe even a DMARC policy, but they definitely don't require p=reject!
Most of my domains have p=none and our mails are accepted by all major

> Hope you understand .

Understood. Had to write that mail anyway ;-)


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