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We found the version of curl provided for RHEL5 does not include the flags "--tlsv1.1" or "--tlsv1.2" provided by later versions of curl.
This means CentOS5 curl does not include/support the flags "--tlsv1.1" or "--tlsv1.2".
RHEL7 and RHEL6 versions do support TLSv1.1 and TLSv1.2 and work when using them. One might need to run yum update for curl and/or openssl to have the versions with the support. On my RHEL6 systems I had...
EDIT: this works but causes sendmail to pause for ~1 minute when it can't find its own FQDN; this slows boot (if sendmail is started at boot and not backgrounded) and would be un-workable on a busy mail server.
Here's how to configure sendmail to send mails when the computer is configured with a hostname but no domain name. It may be of use, for example, if you want to mail system exception reports and do not want to configure the computer as being part of a...
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