On average how many bounced emails does it take to blacklist an email server?
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On average how many bounced emails does it take to blacklist an email server?
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There is no specific rule, this very much depends on the settings of the receiving mail server. An admin might do this even manually so that they will find some spammers based on different log entries and blacklist the IP's. Or if the mail server uses an RBL, it might not be the bounces that this specific server receives, rather if you have Spamtrap addresses in your spam recipient list, the IP will be blacklisted on lots of servers at once.