Mistakes do happen. But sometimes, ISP's and mail service businesses have no interest in righting what went wrong. And since they are not blamed, they get away with doing nothing. But in the mean time, your and my business is hurt by this.
So, it is time to point customers in the right direction. If more and more customers know where to complain if they do not get the e-mail they wanted, chances are that the ISP and/or mail service are forced into action.
There's a lot an ISP or mail service can do. Customers should have the possibility to "whitelist" you. A "whitelist" is a list of e-mail addresses or domains from which the customer allows mail to continue, even when the filter thinks it's "junk". One option that's not an option is to ask customers to switch off the filter. SPAM is just too big a problem for this.
