Emails going to spam folder in gmail

[Nemo Nusquam]

On 12/28/20 17:12, Bill Degnan via cctalk wrote (in part):
> I have noticed the same email addresses' messages routinely end up in 
> the spam folder of gmail.
[...]
> For those of you who run your own mail servers please consider 
> updating your DNS / authentication to match gmail standards. 
Apologies for asking but what the gmail standards?  Anything from 
yahoo.com, some of Google's own alerts, and items from 
lists.dwarfstd.org were all marked as spam.

N.

> There are a lot of how-to's on the web, each mail server is different 
> and there is no simple fix that applies to all. Bill