I just hope it dosent have too much of an effect on SPAM, because any spammers can now send emails from anything@wegfwegwegwegweg.uk.com, and mailservers that check for existing domains will pass it, unlike without wildcards where that domain wont exist and the SPAM will be rejected.
It won't. Most mail servers that check against valid domains try to reverse resolve the ip-address of the machine that connects to them. They don't pay any attention to the address in the "from" field. -- So mail would have to be sent from an ip address that resolves back to blah.uk.com. Which they would probably have to spoof. And if you're going to spoof something, why on earth spoof blah.uk.com
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I just hope it dosent have too much of an effect on SPAM, because any spammers can now send emails from anything@wegfwegwegwegweg.uk.com, and mailservers that check for existing domains will pass it, unlike without wildcards where that domain wont exist and the SPAM will be rejected.
It won't. Most mail servers that check against valid domains try to reverse resolve the ip-address of the machine that connects to them. They don't pay any attention to the address in the "from" field. -- So mail would have to be sent from an ip address that resolves back to blah.uk.com. Which they would probably have to spoof. And if you're going to spoof something, why on earth spoof blah.uk.com
In other words, non-issue.