This idea has been merged into another idea. To comment or vote on this idea, please visit CUSTCOM-I-1726 Color fax transmissions.
In this day and age, there is a 99% chance that any pdf will have some color in it somewhere. This shouldn't cause a fax to fail. You should just convert it to black and white. (In reality you should just support color faxes, but I see that's been denied in the past). You just pointed me to another idea that has already been labeled as "will not implement". Also that idea assumes that faxes ARE converted to black and white, which is currently not the case. My experience has been that ANY color in a PDF causes the fax to FAIL. This is not the same as requesting color be allowed. I'd be happy if it would still send it as black and white.