From what you have described with respect to the summons and complaint taped to your ex-husband's front door addressed to you, the summon and complaint was improperly served upon you since you do not reside at the address where it was delivered coupled with the fact that the summons and complaint was not personally delivered or sub-served.I suggest that you may want to consult with an attorney that practices in the area of consumer law to assist you and decide whether a motion to quash service may be appropriate for you based upon the facts of your matter.