Ala. R. Crim. P. 17.4
Committee Comments to Rule 17.4 as Originally Adopted
An important new feature of the service of subpoenas is the general requirement to use certified mail (instead of ordinary mail), which under present day postal services would be more expeditious. It could prevent some losses and delays. Also, under some varying factual situations it would be fairer to the addressee than the use of ordinary mail. Moreover, under Rule 17.4(c) the use of certified mail is not necessary if "otherwise ordered."