SMTP address spam check

If you get an error such as this below

Sep 12 22:41:33 ub1 postfix/smtp[12138]: 223E5385C5F7: to=<>,[]:25, delay=1, delays=0.05/0/0.98/0, 
dsn=4.0.0, status=deferred (host[] 
refused to talk to me: 
554 Your access to this mail system has been rejected due to the sending 
MTA's poor reputation. If you believe that this failure is in error, 
please contact the intended recipient via alternate means.)

check the reputation by reputation

Of course substitute the search_string as required

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