I wish someone would put this in a step by step tutorial.
Joly
On Sun, Nov 3, 2024 at 9:03 PM Mark Sapiro wrote:
> On 11/3/24 10:39, Hoover Chan via Mailman-Users wrote:
> >
> > Is it simply some combination of SPF, DMARC and DKIM? Maybe a
> > particular way to set these up? Or something else? (The MTA? DNS?)
>
> Your server needs to identify itself with your domain name (`myhostname`
> in Postfix). That domain needs an A record in DNS with the server's IP
> and the IP needs a PTR back to the domain name. All outgoing mail should
> be DKIM signed and you should publish and appropriate SPF. It is also
> said that publishing a DMARC record, even with `p=none` can help too.
>
> Mailman must also apply DMARC mitigations. This is tricky because gmail
> publishes a DMARC policy on `none`, but if mail to a gmail address is
> From: a gmail address, gmail wants it to pass DMARC, so you either have
> to apply DMARC mitigations to all mail (DMARC Mitigate unconditionally =
> Yes) or add `^.*@gmail\.com$` to DMARC Addresses.
>
> --
> Mark Sapiro The highway is for gamblers,
> San Francisco Bay Area, Californiabetter use your sense - B. Dylan
>
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Joly MacFie +12185659365
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