Hi, Marian
Thanks for your help. Actually we do have such subscription page in each email footer. But still we meet some issues. Some clients prefer to receive emails for particular products. So even for Newsletter for example, they would like to receive the one for shoes but not clothes. We couldn't create such complex two dimensions for clients to choose. Further more, most of the clients choose to reply the email or call sales directly for their preference, instead of submitting a form . That is why we just create lots of shared list for detail group, standing for different products with different email types. So we still have to update those on manual.