To reply to the domain administrative contact confirmation mail, simply use the function Reply of your mail software. For Outlook Express go to Reply to Sender under Message on the menu bar. For Eudora use Reply which is under Message on the menu bar. Then cut and respond Yes as seen in the sample below.

>Authentication Key is 35102586

>TECHNICAL CONTACT confirmation [Yes/No]..........: Yes

Please note that you MUST NOT change or modify the wording of the above two lines. Just respond Yes after the colon.