Hi, we have a secure web portal that sends us an email when someone logs in and makes some changes to their account. It is handled and hosted by the developer. It worked fine for a long time but recently we have been receiving bounce backs because the developers server is not authorized to send email on behalf of our Domain.
I have added their servers IP4 address after the IP address of our mail server, in the SPF record. Does the syntax look correct.
That looks workable, but I recommend you put the IP addresses first as it makes it faster for receivers to check it, like this:
There's not usually much to be gained by ptr entries in SPF records.
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