Mailing Cards to SBCC

[DandJ19]

I’m wondering what the rules are for cards at SBCC. Can you send cards with colored envelopes? Do they allow cards with foil etc? So far, I’ve been sending the simplest cards I can find with plain white envelopes, but most cards seem to have embellishments. I’ve especially noticed this with Valentines cards, so I was wondering how strict they are about this. Thanks.

[sidewalker]

Hit up the dollar stores. You can usually find some nice cards and not too fancy.
I'd avoid anything with anything other than paper.
(talking about the foil or glitter or the like)