On Tue, Jan 17, 2023 at 02:50:04PM +0100, Peter N. M. Hansteen wrote: > Just a wild guess based on experience - do those deliveries happen over IPv6?
In this case, no. We* only have IPv4 throughout the stack - IPv6 is disabled everywhere. *Proofpoint Essentials I did think it might be TLS - but every test I've seen did hand off to gmail over TLS - so not that. Regards, PG _______________________________________________ mailop mailing list [email protected] https://list.mailop.org/listinfo/mailop
