I just wanted to create a new passkey. But the mail did not arrived. I looked to my PostFix logs and saw:
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Mar 22 21:41:01 s1 postfix/smtpd[18229]: warning: hostname foldingathome.org does not resolve to address 65.254.110.241
Mar 22 21:41:01 s1 postfix/smtpd[18229]: connect from unknown[65.254.110.241]
Mar 22 21:41:02 s1 postfix/smtpd[18229]: NOQUEUE: reject: RCPT from unknown[65.254.110.241]: 450 4.7.25 Client host rejected: cannot find your hostname, [65.254.110.241]; from=<noreply@foldingathome.org> to=<kontakt@kluthr.de> proto=ESMTP helo=<foldingathome.org>
Mar 22 21:41:02 s1 postfix/smtpd[18229]: disconnect from unknown[65.254.110.241] ehlo=2 starttls=1 mail=1 rcpt=0/1 data=0/1 rset=1 quit=1 commands=6/8
Mar 22 21:41:04 s1 postfix/smtpd[18229]: [b]warning: hostname foldingathome.org does not resolve to address 65.254.110.241[/b]
Mar 22 21:41:04 s1 postfix/smtpd[18229]: connect from unknown[65.254.110.241]
Mar 22 21:41:05 s1 postfix/smtpd[18229]: NOQUEUE: reject: RCPT from unknown[65.254.110.241]: 450 4.7.25 Client host rejected: cannot find your hostname, [65.254.110.241]; from=<noreply@foldingathome.org> to=<kontakt@kluthr.de> proto=ESMTP helo=<foldingathome.org>
Mar 22 21:41:05 s1 postfix/smtpd[18229]: disconnect from unknown[65.254.110.241] ehlo=2 starttls=1 mail=1 rcpt=0/1 data=0/1 rset=1 quit=1 commands=6/8
Regards,