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Is this a correct for relayhost exception when from=<> ?

From: Benjamin Donnachie (benjaminpy-soft.co.uk)
Date: Fri Jun 01 2007 - 10:09:56 CDT


I currently relay all traffic through my ISP's server. Unfortunately,
it rejects bounce messages with from=<>.

Consequently, I need to deliver such messages directly to the recipients
MX. In attempt to work around this, I have unset relayhost and added
sender_dependent_relayhost_maps=pcre:/etc/postfix/sender_dependent_relayhost
to my main.cf.

The file sender_dependent_relayhost contains:

/.*/ smtp.my.isp.example.com

It seems to be working fine. Are there any problem using this method
which I should be aware of?

Take care,

Ben