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We read everything and usually reply within a few business days. The messages that improve the site most:

Spec changes: "Lab X just updated its resolution chart" or "Instagram changed its ratio rules" — include the link if you have it. These get priority; every page here carries a Last-verified date for a reason.
Corrections: a number that doesn't match its cited source. We re-fetch, fix, and re-date the page.
Topic requests: a print/DPI question you couldn't find an honest answer to.
Partnerships: relevant, disclosed, and clearly useful to readers — start with what you propose and where it would fit.

For anything about your specific order — crop previews, shipping, refunds — please contact your photo lab directly; we publish their specs but have no access to their systems or your account.