Case is a Texas case, but Defendant is currently in New York and doing business in Texas from New York. The citation was sent to TExas-SOS citations unit who forwarded it to Defendant's listed office and registered agent in New York. However the defendant did not accept the certified maail and it returned. The Texas SOS sent the Whitney Certificate mentioned the mail was undelivered as nobody accepted the mail. Is this Certificate which shows that the Defendant did not accept the mail enough proof of Service? Will that be sufficient for Texas State court to Satisfy Service of Process requirement?