On 2025-11-18 at 04:17:50 UTC-0500 (Tue, 18 Nov 2025 10:17:50 +0100)
lejeczek via Postfix-users <[email protected]>
is rumored to have said:
Certainly no PTR record for my IP but - do ISPes even do that - for us
at home or in general customers anywhere, as opposed to
co-located/hosted stuff?
In some places, yes, BUT it may be require a different class of account.
For example, I have a /29 static network where each of the 5 operational
IP addresses has its own meaningful PTR. I pay my connection provider
extra for the static public network with no filtering and rDNS.
(or registrars who can, who do reverse too?)
I'm not going to move home there to such ISP's area, but sincere
question, just out of curiosity.
I read somewhere that 'hosts' locally, of such a private postfix might
play a role - when /hosts resolve/**to *localhost* (first or only)
and then postfix might send/use that - I don't remember details, if
that was a valid issue at all, but..
The hosts file can only change what the machine it is on believes about
its name. Postfix uses the system hostname for $myhostname by default
and via that for other parameters, but it can't fix what a remote server
sees when you send mail to it.
--
Bill Cole
[email protected] or [email protected]
(AKA @[email protected] and many *@billmail.scconsult.com
addresses)
Not Currently Available For Hire
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