There’s been an increase in spam to a user’s primary address since VM was hacked.
VM hasn't been hacked. They left the door open on a database and that was dealt with after they were notified by a whistle blower. There is no evidence that the database has been accessed by anyone other than the whistle blower.
This cannot be used as a reason to explain why some customers are seeing increased levels of spam.
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For what it is worth, I have never received spam to my primary address, probably because it is so seldom used.
If the primary address is not used, it is a valid question as to how spammers have found it. It could be the hack of a source database or, perhaps, a cybercrook's computer using information from different sources and working out a primary address by trial and error.
If the primary address is used frequently, of course, there are many ways in which it could have fallen into the hands of spammers. I suspect the recent hacks and ransom attacks we hear about are just the tip of the iceberg.