Invisible tape is your friend. Put it on the postcard, then you can write on it with normal pen. Problem solved.
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What is a CD pen??!
I will sometimes glue some paper on or add a sticker speech bubble and write in that. Curious what others do too.
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Sharpies Ultra Fine Point Fineliners work very well for me, they dry relatively quickly on glossy postcards.
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What we call CD pens here are permanent markers used for writing on CDs and DVDs without getting smudged. They vary in thickness, so I guess some very thin would be suitable for postcards. I don’t know if that’s what was meant by the original poster, though 
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I use a sharpie fine tip pen
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These are my absolute favorite to write on glossy cards:
Sakura 34061 3-Piece Microperm Ultra-Fine Point Pen Set
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S H A R P I E S
They are amazing and after around 20 seconds they do not smear. I love them so much lol.
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There’s also some good recommendations in this thread: Your favorite pen to write postcards?
And there’s also a few other links on the first post that are worth checking out
I’ve been using a fine point sharpie and a marker from the Sakura micron series
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I was using a Sharpie–maybe I just need to write one line at a time and let it dry.
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I use the Tombow Mono Twin
I bought one by accident, but they are really great for glossy paper. Sadly, they’re only available in three colours as far as I know. I also use them to write the address on most postcards so that it doesn’t come off in the rain
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Once I had really glossy cards where not even a permanent marker / CD pen would work. I then printed the text and glued it on the card and never bought such stupid cards again.
On others normally a sharpie would do.
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Angelthecat, That is what I am dealing with! Your response made me laugh! “Never bought the stupid cards again” I understand completely! Quite frustrating when even permanent/sharpie pens won’t work. I will probably do the “glue message” method like you did.
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Very thin rollerball pens, like 0.3 thin. I just leave the cards for the ink to dry for a couple of hours after.
Fountain pen works too, but that’s a more fancy and expensive way.
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I found a solution this week! I little sandpaper! I sanded off the glossy!
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This could really help, thanks for the input 
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I use a sharpie ultra tip. Wait a little bit for ink to dry.
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Sharpie plus blow dryer 
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I also have like lamination sheets that I can just to shape and cover ink and it works well