Microsoft and Gmail are refusing our emails

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superdrivesam
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Joined: 2019-08-30 19:49

Microsoft and Gmail are refusing our emails

Post by superdrivesam » 2019-09-04 10:31

Our SPF, DMARC, and DKIM all pass with flying colors at any 3rd party site, such as MxToolBox and I can send emails to all O365 tenants, but emails to hotmail.com, outlook.com, and gmail.com, and TrendMicro ALL end up no where. Not even an NDR. Here is a header of an email sent to an O365 tenant:

spf-permerror (sender IP is xxx.xxx.xxx.xxx)
domain of xyz.com used an invalid SPF mechanism

At the same time, here is SPF test results from MxToolBox:
MxToolBox_SPF.jpg

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RvdH
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Joined: 2008-06-27 14:42
Location: Netherlands

Re: Microsoft and Gmail are refusing our emails

Post by RvdH » 2019-09-04 11:32

Hard to help you to find the issue without the actual domain name and/or IP address
CIDR to RegEx: d-fault.nl/CIDRtoRegEx
DNS Lookup: d-fault.nl/DNSTools
DNSBL Lookup: d-fault.nl/DNSBLLookup
GEOIP Lookup: d-fault.nl/GeoipLookup

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