Carlos E. R. wrote:

>> Auth should have happened before mail from.
> 
> I believe they do it on purpose :-(

Can't help you there, I'm afraid.

> Worse, all Spanish ISP's and mail accounts I have do the same, meaning I 
> can't relay any of my redirector addreses like sourceforge or ieee.

It would probably be the best solution to use a virtual private server,
they cost about 10 Euro per month, that will give you a fixed IP, correct
dns/reverse dns and probably a domain name of your choice.

>> /etc/postfix/sender_relayhosts:
>> [EMAIL PROTECTED]    [relayhost]
> 
> But... I have a doubt. Will that relayhost be used for all mail sent from 
> [EMAIL PROTECTED], or only to those destinations in the transport file?

Yes, it will be used solely based on the sender address then (if the
address is found in the sender_dependend_relayhost_maps).

> Meaning, I want to send all my email direct, except to those destinations 
> I define in the transport file which sould use a relay choosed on the from.
> 
> Alternatively, send always via relay defined in sender_relayhosts, except 
> to some destinations I want to send direct.

Okay, this might get really geeky and cumbersome, but you could
theoretically set up two instances of Postfix (not listeners!), where the
first instance is trying to send directly with "soft_bounce=yes" and
fallback_transport = smtp:[ip-second-instance], so rejected mails will
will be transfered to the second instance.

This instance knows, that all mails have to be relayed via a relayhost, so
it is configured to use sender_dependent_relayhost_maps with soft_bounce=no.

That would probably do most of what you want to achieve, but it is quite a
 bit of overhead to set up and manage. I have a few doubts, if it is
really worth the effort.

>> By the way, I don't know if your ISP deleted my direct mail to you or
>> shoved it into the spamfolder or whatever, but I sent you a private mail
>> to tell you that you posted your auth data... :-/
> 
> Got it, thanks. :-)

Okay, unfortunately I've seen too many ISPs who silently delete unwanted
mails.


-- 
Sandy

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