Problem sending email to Gmail

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http://forum.directadmin.com – Hi, Today i noticed a problem sending email to Gmail, due to some IPv6 config error: Quote: This message was created automatically by mail delivery software. A message that you sent could not be delivered to one or more of its recipients. This is a permanent error. The following address(es) failed: [email protected] SMTP error from remote mail server after end of data: host gmail-smtp-in.l.google.com [2a00:1450:4013:c01::1a]: 550-5.7.1 [2a00:e10:xxxx:2::xxxx:xxxx 16] Our system has detected that this 550-5.7.1 message does not meet IPv6 sending guideli (HowTos)