How to fix Spoofing Errors by updating your DNS
Microsoft / Office365 / Outlook / Live / Hotmail
will sometimes put warning messages on emails from your mailing list.
This sender failed our fraud detection checks and may not be who they appear to be. Learn about spoofing
This message is placed at the top of the email.
It does not block the email, but it confuses the receipent.
Mailing list mail is From the person who sent the email, while it's the Mail-List.com servers that deliver the message.
The mismatch is what causes Microsoft to create the warning message.
You can signal to Microsoft that Mail-List.com is allowed to send emails on your behalf
We use the SPF records in the Domain Name Server (DNS)
You need to have access to update your DNS SPF records
If you do, you simply need to insert one extra part into your DNS SPF setting.
You want to update the TXT record. The TXT record contains the SPF settings.
This will tell Microsoft, and other ISP's, to look up the SPF records at Mail-List.com and include our IP addresses as valid email senders.
So you want to add include:_spf.Mail-List.com to your existing SPF records
For example, before and after
v=spf1 a ip4:188.8.131.52 -all
v=spf1 a ip4:184.108.40.206 include:_spf.mail-list.com -all