On November 26, I contacted The March of Dimes through a form on their Web site, asking them to remove me from their postal mailing list. (This was not because of a specific grievance against The March of Dimes; I’m trying to get us removed from all mailing lists to reduce wasted time dealing with junk mail and damage to the environment from mailings that go straight to recycling.)
Their Web form asked for an email address, which I gave them, so that they could respond to my request. As is my practice, I gave them an organization-specific email address, so that I could track what they did with it. I also checked the option on the Web form telling them that I didn’t want to receive any bulk email from them.
They never responded to my postal unsubscribe request.
They did, however, disregard my specific instructions about bulk email — I received spam from them yesterday.
It has been my experience that there are many worthy charitable organizations which don’t send spam. I therefore refuse to support organizations which do, and I discourage others from supporting them as well.