Re: [gentoo-user] Alternate Incoming Mail Server

[Grant Taylor <gtaylor@gentoo.tnetconsulting.net>]

On 4/6/20 10:49 PM, J. Roeleveld wrote:
> I am afraid most (if not all) ISPs will reject emails if the reverse 
> DNS does not match.

My experience has been that there needs to be something for both the 
forward and reverse DNS.  Hopefully they match each other and — and what 
I call — round resolve each other.  Ideally, they round resolve /and/ 
match the SMTP HELO / EHLO name.

I think you can get away with at least the first part.  There will 
likely be warnings, but they probably won't prevent email delivery in 
and of themselves.

> Using a dynamic range is another "spam" indicator and will also get 
> your emails blocked by (nearly) all ISPs.

Yep.

If it's not blatant blocking of believed to be dynamic clients (how is 
left up to the reader's imagination), you start to run into additional 
filtering that may or may not reject the message.

> I would suggest putting your outbound SMTP server on a cheap VM hosted 
> somewhere else. Or you get an outbound SMTP-service that allows you 
> to decide on domain name and email addresses.

Unfortunately the spammers have made many such cheap VMs IP net blocks 
have bad reputations.  I'm starting to see more people blocking the 
cheaper VPS providers.



-- 
Grant. . . .
unix || die