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Jun 13 14:58:54 server postfix/smtp[820]: certificate verification failed for mail.gmx.net: num=20:unable to get local issuer certificate
Jun 13 14:58:54 server postfix/smtp[820]: certificate verification failed for mail.gmx.net: num=27:certificate not trusted
Jun 13 14:58:54 server postfix/smtp[820]: certificate verification failed for mail.gmx.net: num=21:unable to verify the first certificate
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