OT: E-mail spoofing and how to prevent it

[Gerard]

Can't stop that. I've been very careful about where my e-mail address 
goes and got myself a new e-mail address a few years back (own hosting 
site and have about 10 e-mail addresses for various things). Now however 
the junkmail is increasing again.

Lucky I've not been spoofed yet.

All you can really try and do is filter it out with your e-mail program 
of choice. If you can, add an extra tag to your e-mail headers. Then 
create a filter that looks for e-mails with the sender as your e-mail 
address, and that does have the custom tag, and then those can be deleted.