I received a gmail from the address of a friend who is long out of contact.
It is possible to use a utility/service such as mail2web.com to define a sender email that differs from the true sender address hence when the raw-text of the message carries a line as below
domain of ***@hotmail.com designates 65.54.190.21 as permitted sender
What does the above line mean? Does it indicate the sender address was something other than the ***@hotmail.com mentioned?
Best Answer
That statement is gmail's checking of the Sender Policy Framework records for the domain that the sender's address is in, to verify that the owner of the domain (hotmail.com) wants to allow the sending server (65.45.190.21) to send email for the domain.
So, the hotmail.com domain specifies this as its SPF:
Which turns into a big mess when we look at all those includes:
The address (65.45.190.21) is in the 65.54.128.0/17 block specified in
spf-b.hotmail.com
, so the mail is allowed.