For the second month in a row, Best Buy has had to inform customers that their e-mail addresses were stolen.

On April 22, the consumer electronics retailer discovered some e-mail addresses had been exposed in a security breach at a third-party vendor. Best Buy says it then notified customers and began pursuing legal action against the vendor.

The retailer says it had earlier ended its relationship with the unnamed vendor, but it was "a strategic business decision unrelated to data security," according to a Best Buy spokeswoman.

Best Buy was one of the dozens of companies that warned customers last month that their e-mail addresses had been stolen in a breach at e-mail marketing services provider Epsilon. This is apparently unrelated to that incident.