When connecting with IPv6 from a host with no reverse DNS, evo will send the
IPv6 literal in the EHLO without properly surrounding it in .
It looks like camel_gethostbyaddr() is actually returning "2002:c1ed:....:a42a"
as if it were the host name, and Evo then just says "EHLO 2002:....:a42a". And
gets told to sod off by the mail server, because that violates RFC2822.
Will be fixed in next build.