... mailbox - the mailbox name (username) . ... address_string = "Hartmut Holzgraefe <hartmut@cvs.php.net>, postmaster@somedomain.net, root"; $address_array = imap_rfc822_parse_adrlist($address_string,"somedomain.net"); if(! is_array($address_array)) die("somethings wrong\n"); reset($address_array); while(list($key,$val)=each($address_array)){ print "mailbox : ".$val->mailbox."<br>\n"; print "host : ".$val->host."<br>\n"; print "personal: ".$val->personal."<br>\n"; print "adl : ".$val->adl."<p>\n"; } . ...