Anyone that knows how to get in touch with the admins on iphmx.com?Getting a
lot of incoming SPF rejects on iphmx.com (mail destined for me, but rejected
because sender SPF is faulty) - who owns that server?The thing is that
iphmx.com seems to be a MaaS infrastructure who tells clients to use exists: as
SPF records.Like: exists:%{i}.spf.hc2347-76.eu.ipmx.comOne
example:23.90.102.86.spf.hc2437-76.eu.iphmx.comThe problem is that these
resolve to a private IP (172.0.0.2) which causes SPF failures due to DNS
rebinding protection. Returning private IP adresses for external use is a big
no-no.Works well for DNSBLs because in those situations its easy to configure a
exception for the DNSBL server. Not so easy to configure an exception for all
SPFes.Recommended DNS configuration change:Have the A record return its own
IP:23.90.102.86.spf.hc2437-76.eu.iphmx.com IN A 23.90.102.86Best regards,
Sebastian Nielsen, owner of sebbe.eu_______________________________________________
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