Server is using its hostshort name, not its FQDN to send email FROM and HELO. It's being rejected:
How do I force it to use its full hostname? It's using it in the From header as well as HELO, despite /etc/mailhelo forced to be hostname -f, which works, and full forward and reverse is set ok.
host mx.*.com.cust.example.com [216.40.xx.x] SMTP error from remote mail server after HELO u202: 504 5.5.2 <u202>: Helo command rejected: need fully-qualified hostname
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