Postcard or card

Two different objects, not one setting. Pick the one you would actually put in a postbox.

Pick the comic

Nothing matches that. Try a word from the drawing rather than the title.

Write it

What you write here is exactly what lands. There is no preview, because this is the card.

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Send it

One of these works today. The other three need an account and a server behind them, and neither exists yet — so they are switched off rather than pretending.

Your link

Here it is. Send it to them however you like.

The whole postcard travels inside that link, so there is nothing on our end to lose, expire or delete. It also means anyone you give it to can read it — which is what a postcard is.