Problem with Ifolor and my Canon 5D JPEGs

I wanted to make prints out of my photos today, and used the company I've previously have: Ifi from Finland. Nowadays the company is named Ifolor, but their offerings are almost the same as previously. Except, two things: they don't anymore offer large prints, meaning 75 x 50 cm (around 30 x 20 inches), and there is a problem with larger picture files.

If I convert images from my EOS 5D to JPEG, they are usually in the range of 4-7 MB, depending on the picture itself. However, if you try to upload such pictures to Ifolor, you will get the following error:

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ifolor Uploader Control
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Tiedoston koko ylittää sallitun ylärajan 6815744 tavua.
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OK   
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This means that they now have a limit of 6815744 bytes for pictures. Okay, this is well for pocket-sized digicams, but not for the largest resolution DSLRs. Think about Canon EOS 1Ds Mk III, for example. :-) Of course, they are a consumer-oriented company, but previously with Ifi this wasn't a problem. Now you either have to resize your pictures a bit smaller (my choice) or increase the JPEG compression factor.