On Sat, Jul 12, 2014 at 04:22:57PM +0200, A. Schulze wrote:

> it may happen that postfix announce 8BITMIME SMTP extension and clients use
> that by submitting messages
> it may happen postfix has to relay such messages to a legacy server not
> supporting that extension.
> in this case postfix will recode the message.

The transformation is lossless.

> it that situation visible in the logfile?

No.

> I like to do some statistical analyses how often my MTAs will destroy DKIM
> signatures for example.

Sing after 7-bit downgrade, and DKIM signatures will never be broken.

> Are there other situations postfix has to recode a message?

No.

-- 
        Viktor.

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