No. I have used sifted pine bark mulch though, with good results.

What size does the mulch come out to be? I've screened mulch before to about 3/8 inch.

The stuff above seems to stay wet in the center while the top and sides are drier. I usually end up rotting the roots with this type of mix. I know vendors use it and I was wondering if they can ship internationally this way because it's not soil. It was just a thought.

Between 1/4 and 1/2 inch is what I aim for.

Shipping internationally might work with that, as an imidacloprid dip for at least 2 minutes is required prior to shipping. You can see why dirt would not be advised. Any mix that is dirt/soil free is accepted, not just for ease of dipping, but also to keep soilborne nasties (of which, some are notoriously difficult to eradicate) out of the States.

Also, regarding root rot: remember many trees contain tannins in their wood. Some are at toxic levels, even for epiphytes, and even with soaking. Pine and cypress (for wood itself)are usually the safest (tree fern, cholla and cork bark, are the BEST for mounting) cedar is pretty safe, but some wood should be avoided, like oak, willow (great for rooting), sumac, chestnut, and fir.

Also of note, chemically treated processed wood should NEVER be used in a potting mix, for obvious reasons.

Uh oh, I have most of my citrus trees in fir bark (Repti bark). That's what most people have recommended over on the citrus forum. Maybe I should stick to screening pine mulch

Reptibark is fine, as it has been processed (in a good way) to remove tannins!

Oops, seems I was wrong about fir bark tannins! Or maybe tannins, in general? Perhaps they are not as harmful as I was led to believe?

http://www.aos.org/orchids/additional-resources/potting-media-reviewed.aspx

Ok, after more digging, an over-abundance of tannins CAN, indeed, be harmful, but pre-soaking media releases enough of the excess tannins to make it safe. When you rinse the media, you should rinse until water runs clear. Each time you water, tannins will be released, but the amount is not significant enough to do much damage.

I could find NO info pertaining to trees with overly excessive tannins for potting medium, but as a general rule, cedar, pine, fir, cholla, freshwater driftwood, cork bark, and tree fern, seem to be the safest (and most popular) mediums to use.

Okay good. Sheer panic came over me for a minute lol.

Thanks for the research.

lol - I know sometimes it's overwhelming and makes your head spin. (in my case it's like Linda Blair in The Exorcist - lol)