On 2007-01-20 12:32:48 -0500, Matt Sergeant wrote: > On 19-Jan-07, at 4:59 PM, Michael Holzt wrote: > > >>I was thinking of rejecting mail when the MAIL FROM is empty or > >>set to > >><> during the MAIL FROM stage. > > > >Do not. "<>" is the legitimate envelope sender for bounce messages and > >shall never be blocked. Unfortunately this can be abused by spammers, > >but it is nevertheless harmfull to block "<>". > > Nonsense. I block all mail from <> and have done for 2 years (maybe > more).
Do you do this at DATA? Because I get through RCPT fine with your email
address:
Jan 20 20:25:03 laire smtpcbd[23415]: trying ip 62.173.71.110
Jan 20 20:25:06 laire smtpcbd[23415]: connect: 220 bodger.sergeant.org ESMTP
qpsmtpd 0.28 ready; send us your mail, but not your spam.^M
Jan 20 20:25:06 laire smtpcbd[23415]: ehlo: 250-bodger.sergeant.org Hi
laire.wsr.ac.at [143.130.16.21]^M
Jan 20 20:25:06 laire smtpcbd[23415]: ehlo: 250-PIPELINING^M
Jan 20 20:25:06 laire smtpcbd[23415]: ehlo: 250-8BITMIME^M
Jan 20 20:25:06 laire smtpcbd[23415]: ehlo: 250-AUTH CRAM-MD5^M
Jan 20 20:25:06 laire smtpcbd[23415]: ehlo: 250 AUTH=CRAM-MD5^M
Jan 20 20:25:07 laire smtpcbd[23415]: mail from: 250 <>, sender OK - how
exciting to get mail from you!^M
Jan 20 20:25:07 laire smtpcbd[23415]: status=OK
Jan 20 20:25:07 laire smtpcbd[23415]: rcpt to: 250 <[EMAIL PROTECTED]>,
recipient ok^M
Jan 20 20:25:07 laire smtpcbd[23415]: status=OK
Jan 20 20:25:07 laire smtpcbd[23415]: quit: 221 bodger.sergeant.org closing
connection. Have a wonderful day.^M
> There's no harm been done,
You won't get any bounces, so if one of your mails can't be delivered
after it has left your MTA, you won't get notified. Also, if you block
it at the MAIL or RCPT stage, SMTP callbacks (as done by Exim, Postfix,
or my smtp_callback plugin) won't work and you won't be able to send
mails to MXs which use this.
> and for my little domain with 2 users I'm blocking up to 30k emails a
> day that way.
30k emails for existing email addresses? You must have seriously pissed
off some spammers.
hp
--
_ | Peter J. Holzer | I know I'd be respectful of a pirate
|_|_) | Sysadmin WSR | with an emu on his shoulder.
| | | [EMAIL PROTECTED] |
__/ | http://www.hjp.at/ | -- Sam in "Freefall"
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