Re: How to avoid being classified as spam by Google?

[Allen Coates]

On 07/10/2019 06:11, martin f krafft wrote:
> Quoting "Wietse Venema", who wrote on 2019-10-06 at 19:13 Uhr -0400:
>> Perhaps the SMTP client IP address 2001:db8:bad::cafe:: has no PTR record (or
>> the name does not resolve to 2001:db8:bad::cafe::).
> 
> Good point, but the address has a PTR record to a name with an AAAA record
> pointing to the address.
> 
Only one set of double-colons is allowed in an IPv6 address.   It expands to an
unspecified number of zeros; doing it twice results in ambiguity.

Allen C