On Tuesday 09 December 2003 06:15, [EMAIL PROTECTED] wrote:Courier does not like esmtp HELO/EHLO from internal smtp engines of viruses/spammers, so spam will not be too much.
Hmmmm, if you're right then that would be great. I assume that you can turn on this sort of reverse lookup if you want but I don't think it's on by default.
[EMAIL PROTECTED] jeff]$ telnet localhost 25
Trying 127.0.0.1...
Connected to localhost.
Escape character is '^]'.
220 superman.ivb.sil.org ESMTP
helo big_fat_ugly_spammer
250 superman.ivb.sil.org Ok.
helo [EMAIL PROTECTED]
250 superman.ivb.sil.org Ok.
quit
221 Bye.
Connection closed by foreign host.
[EMAIL PROTECTED] jeff]$
Thats ok. But there is why courier reject most of emails from viruses/spammers:
[EMAIL PROTECTED] root]# telnet 212.116.138.35 25
Trying 212.116.138.35...
Connected to bgoffice.pro-technica.com (212.116.138.35).
Escape character is '^]'.
220 bgoffice.pro-technica.com ESMTP
helo me
250 bgoffice.pro-technica.com Ok.
mail from: [EMAIL PROTECTED]
554 Syntax error - your mail software violates RFC 821.
mail from: <[EMAIL PROTECTED]>
517-Domain does not exist: mydomain.notexist.com.
517 Invalid domain, see <URL:ftp://ftp.isi.edu/in-notes/rfc1035.txt>
quit
221 Bye.
All spans and viruses that I receive last few months are with sender address like <[EMAIL PROTECTED]> or <[EMAIL PROTECTED]> and are to email address that exist in most domains: office@ sales@ .....
And all this spam finish with double bounce to postmaster. When courier try to send bounce to <[EMAIL PROTECTED]> yahoo.com answer is 550 User unknown, so double bounce to postmaster@ i generated.
--
Svetozar Mihailov
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