Are email messages bad for ''Thank You'' notes?

OK, I lost my mother Sunday morning after a mercifully short *8-day battle with cancer, and have received a fair number of sympathy cards (postal mail, not email) from co-workers. When my father died (almost 10 years ago), I sent individual cards in company mail. Is that still the preferred way to send them nowadays, or is email considered OK.
*I know that she must have had cancer for some time before that, but she didn’t show any symptoms until the last eight days.

I don’t think email is OK for thank-yous other than those that are very, very informal. Like, “Thanks for dropping those books off yesterday.” Anything else should be signed and mailed.

Sorry to hear about your mom. I’m glad it wasn’t long and drawn out. Wishing you peace.

Agreed. Definitely do handwritten notes. I think it just shows a little more heartfelt effort in thanking people who were supportive for you.

I’m sorry for your loss.

Yes, handwritten notes, please.

If the job seems like too much, this is a good time to call up those people who said “If there’s anything I can do . . .”

My condolences as well. Mr. S’s sister died a few months after her cancer diagnosis (I never met her), and he says that was an awfully short time. I can’t imagine it being measured in days. Peace to you and yours.