If you choose to eFile using Aatrix “COMPLETE SERVICE” option for W2 or 1099 forms they have extended their deadline to February 2nd at 8am CST to guarantee employee or recipient copies to be mailed and postmarked on Monday, February 2nd.
https://sage100erp.aatrix.com/pages/public/FilingDeadlinesPublic.aspx?v=MAS026