On Tue 06/Jul/2021 20:28:16 +0200 Florian Effenberger via mailop wrote:
Alessandro Vesely via mailop wrote on 06.07.21 at 18:38:
I tried https://www.cyren.com/security-center/cyren-ip-reputation-check-gate
and it says "No Risk" for 188.34.176.133 and "Please enter a valid IP" for
2a01:4f8:c010:587c::1. Is it the latter the one that gives you problems?
The IPv4 is one of the several IPs affected, indeed. I unblocked it again last
week, but it likely will switch back after a while. Not sure if CYREN supports
IPv6 - but the recipient's MX doesn't in any case, so it's not a workaround to
deliver the mails either.
So it's IPv4. Talos[*] reports low email activity on it. Do you send out
DMARC reports and similar stuff? I found that doing so increases my footprint
and hence stabilizes reputation, albeit some point out that reports can be
classified as spam...
Best
Ale
--
[*] https://talosintelligence.com/reputation_center/lookup?search=188.34.176.133
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