On Thu 01/Sep/2022 18:33:48 +0200 Hendrik Boom wrote:
On Thu, Sep 01, 2022 at 11:30:43AM +1000, onefang wrote:
The problem with PTRs is that I run several domains from the one IP
address, and PTR can only point to one of those. It costs money to get
more IPs, my pension is barely coping with the recent cost of living
increases.
That is what MX records are for. It's straightforward to set up
mail.example.com with its PTR having a single name that matches. Then, for all
the other domains set the MX to it. For example:
whatever.domain IN MX 2 mail.example.com.
the HELO (or EHLO) command also uses mail.example.com. Nobody will notice any
difference unless the analyze the message header.
From: uses the virtual domain <user@whatever.domain>.
DKIM signatures with d=whatever.domain.
SPF records at whatever.domain have the address of mail.example.com.
DMARC record for whatever.domain has rua=reports@whatever.domain.
If IP's are expensive, would it help to switch to IPv6?
Not all MXes have IPv6 address. You need an IPv4 to send to an IPv4-only MX.
Google is said to be more severe with mail coming from IPv6 addresses.
HTH
Ale
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