spam filtering and our email security
Thanks for the link, I have read the advice.
I have these observations-
The spam sender changes the sender address each time so hard to block unless the domain is blocked in filters which I do
The spammer sends a batch of emails over a period of a few days, they are wanting a response or to deliver malware- I just ignore them.
The IP address changes each time as they are using a hosted server with a range of ip adresses.
On checking the ip address reputations, the dating emails are sent from IP addresses which are used for hacking, port scanning and brute force attacks.
I will see if my header filter for base 64 encoding works and report back if it does work, previous attempts to filter using headers did not work when I tried to block an ip address.
I suspect that by using base 64 which is encoded, the spam content may then get past spam filters, some do and some do not, it is mixed.
Still unusual that this type of base64 encoded email will not auto forward.
By not ticking Allow HTML formatted email messages in settings, this prevents the html and therefore blocks any images from showing
Each email provider, web mail or email client have there own rules regarding the display of attached images and inline images, and usually by adjusting settings some images can be blocked, but inline images can bypass image blocking, in the case of virgin it dose block all images if the html is not selected in settings. Images can be a security risk so I always switch them off email, unless I do want the images I then turn them on for a wanted email.