[C210N]

The link describes forwarding the spam email to Citibank, where in turn, the complaint itself was blocked due to the content containing spam. Other replies describe going to the Citibank web site looking for complaint emails, and then finding those emails don't work.

I found what I think is an interesting tidbit while perusing thru email specifications (SMTP). Email server implementations MUST support the user "POSTMASTER" as a valid address, thus being a reliable receptacle for email for any email domain. On the other hand, this could be implemented as a "write-only" dead letter office, but you can be reasonably certain the email won't bounce and the address will be valid without looking anything up.

[Deguello]

"looking for complaint emails"

You will find that the FBI is not interested either.

[exnavychick]

Um...huh? 'Fraid I'm not fluent in techno-speak...what were you saying?