Recently, one of our clients forwarded a SPAM to me. It came from the Nationwide Building Society, you'd think they'd know better.
Dear Mrs REDACTED, Some time ago, you may remember, you were kind enough to let us have your email address. Now we have it we'd like to be able to send you email, every now and then, with news of our latest products and services and member information. After all, email is an easy way to stay in touch.
This is SPAM, plain and simple - both bulk and unsolicited.