ssl_protocols = !SSLv2 !SSLv3 !TLSv1 doesn't work with Apple Mail.
ssl_protocols = !SSLv2 !SSLv3 does.
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ssl_protocols = !SSLv2 !SSLv3 !TLSv1
doesn't work with Apple Mail.ssl_protocols = !SSLv2 !SSLv3
does.