Alexy Khrabrov wrote:
> ----- Transcript of session follows -----
> ... while talking to unagi.cis.upenn.edu.:
> >>> MAIL From:<[EMAIL PROTECTED]> SIZE=115
> <<< 451 <[EMAIL PROTECTED]>... Domain must
> resolve
> [EMAIL PROTECTED] Deferred: 451
> <[EMAIL PROTECTED]>... Domain must resolve
> Warning: message still undelivered after 4 hours
> Will keep trying until message is 5 days old
> Why does sendmail try to resolve yaw.suffix.com?
It's an anti-spam measure (rejecting messages where the sender's
address is clearly invalid).
You can disable this check with
FEATURE(accept_unresolvable_domains)
> I own suffix.com, but don't have a static IP for
> yaw, my local box, which I connect via ATT ppp.
> Since yaw.suffix.com It doesn't exist anyways, the
> return mail must come to [EMAIL PROTECTED] -- but
> when I say
>
> sendmail [EMAIL PROTECTED] -q
>
> to flush the queue with that "from" fake, I get
> this:
>
> The original message was received at Wed, 21 Apr
> 1999 02:50:48 -0400
> from root@localhost
>
> ----- The following addresses had transient
> non-fatal errors -----
> [EMAIL PROTECTED]
>
> ----- Transcript of session follows -----
> 451
> [EMAIL PROTECTED]
> unagi.cis.upenn.edu: Name server timeout
> Warning: message still undelivered after 4 hours
> Will keep trying until message is 5 days old
This is a DNS failure. I can resolve unagi.cis.upenn.edu OK, so check
your DNS configuration.
> Now I read Linux Mail-HOWTO and it bluntly says
> sendmail is obsolete and insecure, qmail
> (www.qmail.org) is the king of the hill.
It seems that someone is using the howto to promote their personal
bias as if it were fact.
Try running an `nslookup -q=mx ...' on some large technology
companies, then telnetting to the SMTP port on their mail servers. A
brief sample found most (Netscape, AOL, IBM, Digital) using sendmail,
one (Microsoft) using Exchange, and none running qmail. I guess that
these companies just aren't sufficiently computer literate to `know'
that qmail is where it's at.
--
Glynn Clements <[EMAIL PROTECTED]>
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