See If Email Address Is Valid. Then make sure that domain name is valid. PS: This function is called in the conversion routine of AD_SMTPADR ( CONVERSION_EXIT_SXIDN_INPUT ).
It is a good idea to use caution when responding to any.
Learn to read bounce headers (SMTP replies) to get some insight on what caused an address to hard bounce.
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Failures such as non valid recipients or any other server issue? Or you can provide a file just of usernames and give the optional arguments: -h, --help show this help message and exit -v, --verbose Display each result as valid/invalid. Read our guide on how spam filters think to see if anything mentioned there sticks out about your content.
