Re: sender/receiver verifying ... how ?

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Autor: Piete Brooks
Data:  
Para: Bruno.Vuillemin
CC: exim-users
Assunto: Re: sender/receiver verifying ... how ?
> It's not clear to me what exactely sender_verify / receiver_verify do.

Verify that the sender (and I assume receiver) is deliverable.

This means checking that exim can find a way to deliver to the user.
The delivery channel will do "easy" checks to ensure that the address looks
at least semi-plausible.
For local deliveries, this means that the mailbox is valid.
For remote deliveries, this means checking that the host looks plausible,
e.g. that there is a suitable DNS entry.

> Let's go back to the real world, "@unifr.ch" is not a local domain in


This means it will check "is the DNS info for unifr.ch plausible ?".

> # /usr/local/exim/bin/exim -bv bruno.vuilleminzzzzzzzzzz@???


No problem -- the *host* is valid -- it can't check the remote mailbox.

> Hmmm this looks like the verification looked for the mail exchanger
> for the domain and no more.


Yes -- it can't (in general) do any more.

> I am rigth or I am missing something?


No -- it verifies that the address as processible -- it cannot check that
remote addresses are valid.

> I was probably a bit naive and thinking that either a VRFY or
> a fake mail transmission was initiated on the other way.


Indeed.

And it wouyldn't actually prove anything -- it may just get to a relay.

> It's true that such a control may be considered "paranoid"
> and that checking the MX for a domain is enough.


Indeed.

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