Not just email - but some voicemail too!
I used Plusnet about 10 years ago, but found that their QOS was unfair and their Support was appalling. (We had about 25 clients using it too at that stage) Long since migrated away a long with that of all our clients...
HOWEVER a couple of weeks ago I started receiving a splattering of emails from Plusnet Customer Support - "New Voicemail message received" - along with WAV attachments!!
I can only imagine that they finally re-used my old number and my email was still assigned to that voice-mail box! Crazy. I forwarded to support and the email stopped, but they didn't reply.