SPF Check Fail & White List Not Working.

TWonline

New Member
Sep 24, 2025
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0
1
Hello,

I can't seem to get a whitelist for a domain or IP to work to bypass a failed SPF check;

"Recipient address rejected: Rejected by SPF: 216.71.131.45 is not a designated mailserver for prvs%3D35448e35b%3Dunn0sender%40app.rbc.com (context mfrom, on smtp01.mydomain.com); from=<prvs=35448e35b=unn0sender@app.rbc.com> to=<user@mydomain.com> proto=ESMTP helo=<esa.hc490-56.ca.iphmx.com>"

Yes, I agree the server should be in the SPF list but big bad RBC says otherwise. Yes, I've tripled checked the emails are the legitimate ones that they are sending and we are trying to receive. I've added the domain and IP for whitelisting but it still doesn't seem to work.

Please help,
Thanks.
 
Thank you,

Could that whitelist work by host name too? - esa.hc490-56.ca.iphmx.com? I'm not so big on bypassing SPF checks for a major Bank whom spammers are always trying to impersonate. Could there be other options?