We do a lot of mass emailing of our contacts to promote events, send out newsletters, etc. Some people read and react, some people unsubscribe, but I fear that some might actually mark the email as spam.
Is there any way to figure out whether my domain has been added to email blacklists or spam registries?
Also, if I use a service like MailChimp to send the emails, how would this work? If one unscrupulous customer was using MailChimp for evil, wouldn't it affect all of their customers?