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From: Rocco Scappatura (no email)
Date: Mon Oct 01 2007 - 05:08:20 EDT
> >> It is recommended that you enable the submission port
> (587) and use
> >> it to relay mail (but not accept mail from the public).
> >
> > How could I activate this port?
> >
>
> look for submission in master.cf. keep that for when you have
> enough time though.
Ok.
> > But I'm still a little bit sospicious about the recipient
> validation
> > for my 'external domains'.
> >
> > For example, for an external domain of mine, say 'domain.it', I get:
> >
> > Oct 1 09:40:13 av4 postfix/smtpd[13993]: NOQUEUE: reject: RCPT from
> > unknown[87.250.102.202]: 450 4.1.1 <>:
> > Recipient address rejected: undeliverable address: host
> > mail.bontempi.it[195.96.202.54] said: 550
> > <>: Recipient address rejected: User
> > unknown in virtual alias table (in reply to RCPT TO command);
> > from=<>
> to=<>
> > proto=SMTP helo=<ybvs>
>
> looks good indeed.
I agree with you.
> > And this is OK (It seems to me that it is my SMTP server
> that reject
> > the message for the inexistant address of my external domain). But
> > when I have tried for other external domains and it doesn't
> seems to
> > me that that mail server have the same behaviour. Infact I get:
> >
> > Oct 1 09:58:14 av4 postfix/smtp[19942]: 687F1750193:
> > to=<>, relay=10.30.32.7[10.30.32.7]:25,
> > delay=0.55, delays=0.11/0.29/0.12/0.03, dsn=2.0.0,
> status=deliverable
> > (250 ... Recipient OK)
> >
> > Whatever it is the recipient.. I suppose that in this case the
> > receiving mail server is guilty of this mesleading behaviour..
> >
> > Maybe he has a catchall for his domain or won't verifies
> its recipients?
>
> try a telneting to 10.30.32.7 from the "smtp server" and see
> if it accepts random addresses:
>
> # telnet 10.30.32.7
> EHLO my.hostname
> ...
> MAIL FROM:<someone at yourdomain>
> ...
> RCPT TO:<>
220 av4.sttspa.it
helo sttspa.it
250 av4.sttspa.it
mail from:<valid address>
250 2.1.0 Ok
rcpt to:<> <-- Invalid address>
250 2.1.5 Ok
data
354 End data with <CR><LF>.<CR><LF>
502 5.5.2 Error: command not recognized
kljkjdfkjfd
.
250 2.0.0 Ok: queued as 2582475018D
> if it says recipient ok for any user, then there is a
> problem. possible
So there is a problem.
> explanations:
> - the final server does not validate recipients (broken old
> accept-then-bounce).
> - the final server trusts your server and doesn't validate
> recipients when the client is your server. you'll need to ask
> the admin to change this if possible.
> - the final server has a catchall. Then there is no problem,
> unless they later bounce for some reason...
I will investigate.. Now it is my task to discover the mistery..
In the mean time, many thanks!!!
rocsca
PS: And for the submission port??
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