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Maybe your mail server is using antispam filters like greylisting?

April 26, 2017antispam filters greylisting maybe

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Maybe your mail server is using antispam filters like greylisting?

1 Answer

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Solution: Your greylisting software should have a whitelist somewhere and you should add an entry for *.cacert.org. You should always use the DNS names but currently pings seem to be sent from ip address 202.87.16.201 or 202.87.16.202. Some greylisting systems will accept the ‘ping’ when it is tried again, but the whitelist is the most reliable solution.