Why you want to force an iterator to go back?

Another approach is better: something is true after Relay access denied is encountered and become false when Sender address rejected is reached (hoping thi is your case).

Perl offer you a funny named flip-flop operator (see my recent post about it for links and explaination).

The following short program it is nothing more that: if we are between a START and STOP sentence, print the IP if you find an IP.

use strict;
use warnings;

while (<DATA>){
    if (/^Relay access denied/ .. /Sender address rejected/){

          print "$2\n" if $_ =~ /(\d+)\s+(\S+)/;

    }
    
}
__DATA__
Relay access denied (total: 2)
           1   111.111.111.111
           1   222.222.222.222
           1   333.333.333.333
Sender address rejected: Access denied (total: 50)
           1   200.200.200.200
Relay access denied (total: 1)
           1   255.255.255.255
Sender address rejected: Access denied (total: 50)

##OUTPUT
111.111.111.111
222.222.222.222
333.333.333.333
255.255.255.255
[download]

As you posted as anonymous your first post i missed the opportunity to express you a warm welcome to the monastery and to the wonderful world of Perl math&ing001 !

In addition the special token DATA is very useful to embed some data example to your program: it is described in perldata in the section Special Literals

Regexp::Common::net is a convenient module to match IPs: you see above the regex match 333.333.333.333 as valid IP. As side note do not put real IP data on the Net: use always fake one as iI did.

L*