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    Relay access denied (total: 13)
           1   46.183.217.174
...
           1   46.183.217.169
           1   91.236.75.169
    Sender address rejected: Access denied (total: 50)

use strict;
use warnings;
...
     until (<> !~ /(\d+)\s+(\S+)/);
    }
}

46.183.217.174
46.183.220.138
...
185.29.9.135
46.183.217.165
91.236.75.169