Thanks for your answer,
> Add the external IP of the Exchange server to your SPF record
I'll add the exchange server in the spf for every domain i control, today
> FWIW, I agree your recipient is misconfigured. I've seen similar
reject messages that were equally incorrect before, so I'd be curious to
know what implementation it is that gets this wrong.
I guess i won't know what implementation is used, because it's a
customer, so i don't imagine me giving a phone to them to tell them
their mail filters are faulty, it's a big customer, and it's a somewhat
large company =/
I have one more question :
if i delete my exchange server from the spf so everything is relayed in
and out by the 2 postfixes, is there any chance to be considered as
spammer, for mail servers not using spf ?
I mean misconfigured old mail servers checking MX records, and looking
in the headers, and maybe checking my exchange server because it is the
original sender in my headers ?
It's my first "true" mail server and i don't want to take any risks
Thanks anyway !