Recently I signed up for a newsletter and when the confirmation came in my e-mail I noticed it had this in the bottom corner:
(I have wiped out the website name.) After looking into it I realized that this appeared to be a VCF file that was attached to the e-mail and this is the way Thunderbird presented the file to me.
My question is this: When a person signs up for a newsletter from my site is it a good practice to include a VCF file (as an attachment) in the confirmation e-mail so they can easily add my e-mail address and information to their address book?