Emailobject.py does not parse all Received header attributes correctly

[samitainio]

I have a PR coming up for this issue.

The current version of the emailobject.py file does not properly take into account that there can be multiple interesting attributes defined in a single Received header line.

Example: Received: from spam.sender.com (11-22-33-44.static.vps.com. [11.22.33.44])

In this example our previous version of the script would have been able to pick up the hostname spam.sender.com and the IP address 11.22.33.44. However back in the day, ahem when I wrote the previous version - sorry about that, it was not considered that also Reverse DNS (PTR) Hostname or in this example the hostname 11-22-33-44.static.vps.com would also be relevant to pick up.

There is a PR coming that will fix my past mistake and also otherwise improve on the logic how the Received headers are handled.