[ SOLVED ] Re: A bit off-topic: problems with sending to a Gmail user

[Tim Chase]

On 2022-10-19 07:43, Cameron Simpson wrote:
> On 17Oct2022 21:19, Tim Chase <mutt at tim.thechases.com> wrote:
> >I found that I had to both set my SPF for the sending-server (in
> >my case, my VPS is the sender, rather than outsourcing to a smart-host
> >elsewhere),
> 
> I tried that for us, but some places reject email from our cloud server,
> which is an AWS VM. So the home server runs outbound mail for some/all
> things through the ISP smart host.

Some IP ranges (particularly cloud-service instances which spin up
& down and may have different hosts appearing at the same IP addres)
also have trouble.  For mine, I had the instance running (on the
same IP) for a year or two before I decided to move my mail
functionality there, so I knew it didn't have a history of recently
spamming other hosts.

Similarly, home ISP ranges are also often rejected because the rDNS
resolves to something auto-generated rather than the actual
domain-name.

Just in case you're looking for other tilt-bits that might be used
when rejecting messages.

-tkc