Andreas wrote:

> because
> - the MTA already did the rDNS job
> - I send the failure reports to myself. I still "see" the Source-IP
> field which has not so much information...

As you're not aiming for machine consumption, there's no need for a new field. 
Just use a comment:

    Source-IP: 10.0.0.1 (something.example.com)

RFC 5965 3.5:

    source-ip = "Source-IP:" [CFWS]
        ( IPv4-address-literal /
        IPv6-address-literal ) [CFWS] CRLF

RFC 5322 3.2.2:

    comment = "(" *([FWS] ccontent) [FWS] ")"
    CFWS = (1*([FWS] comment) [FWS]) / FWS


- Roland
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