Bad Email Practise!

It is recommended practise that when contacting people by email for the first time you provide an 'opt in' to future emailers rather than an 'opt out'. Whilst not all companies follow the practise almost all do at least provide a simple 'opt out' or unsubscribe option.

One publishing house seems to have taken a different route - it appears to create a new emailing list for every emailer it sends. Each emailer it sends me has the facility to unsubscribe but I still receive another emailer from them most weeks - and then have to unsubscribe from this list.

Whilst the publishers may think they are being very clever, in my view this is extremely poor practise and does nothing for the image of the business or to encourage me to read their emailers. Indeed I now normally delete them or mark them as spam without reading and don't bother to click on the unsubscribe as it appears to have no effect.

Do you have any other examples of poor emailing practise?