Blue Mountain Arts wants submissions about "friendship, family, special occasions, positive living" and other topics you might find in a greeting card.
They do buy all rights, so once you sell your work, they can do what they want with it after a one time payment. This includes publishing in anthologies.
They pay $300 for poems used in greeting cards or $50 if it's used in an anthology.
You must request writer's guidelines by sending a blank email to email@example.com. Put "Send Me Guidelines" in the subject line. You can also contact them through snail mail:
Blue Mountain Arts, Inc
P.O. Box 1007
Boulder, CO 80306