It seems like the LISTSERV server is sending from an IPv6 address whenever
possible and during those connections, the receiving server (Gmail) is
rejecting because there is no reverse dns record for the IPv6 address. If
that's the case, then the lists.clir.org administrator either needs to
disable IPv6 or an a PTR record for the IPv6 address.

Regards,
Alisak.

Alisak Sanavongsay | Digital Assets Programmer | UC Merced Library |
209.201.9073 | [log in to unmask]






On 9/14/16, 10:49 AM, "Code for Libraries on behalf of Kyle Banerjee"
<[log in to unmask] on behalf of [log in to unmask]> wrote:

>>    - The sending IP must have a PTR record (i.e., a reverse DNS of the
>>    sending IP) and it should match the IP obtained via the forward DNS
>>    resolution of the hostname specified in the PTR record. Otherwise,
>>mail
>>    will be marked as spam or possibly rejected.
>>
>
>Question: Are all people who are getting kicked off using business gmail
>accounts as opposed to personal accounts? Also, do they receive some mail
>or no mail before getting booted off?
>
>The first thing that came to mind is that. C4l is configured so Reply-to
>is
>the c4l list and Sender is the actual sender when it seems that from an
>email handling point of view, the opposite would be preferable.
>
>However, that doesn't explain why all gmail addresses don't have an issue.
>My second thought is that if they receive some mail but have delivery
>errors for others, the sender email my be delivered via servers from a
>domain other than what their return address would indicate. Again, that
>doesn't explain why all gmail users wouldn't get booted off, but my
>experience is that there are some annoying differences between google for
>business and the personal version.
>
>kyle