Color management/ output problems

I design various things in CorelX8 Using Solid coated colors to hopfully achieve them on a wide format decal printing machine with its own rip. My issue is from the Corel side I cannot export my designs as Jpegs or PDF's and the colors remain vibrant and true. So during the approval process by email my customers never get that nice crisp clean color we want. I want to design and print in full gloss, but my proofs or examples seem to come across as matte finish.  I know very little about color management so please educate me and talk me through how i need to make it all happen.

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