On 26/05/06 11:25, Sándor Zsolt wrote:
The whole system works fine, but recently notified that the incoming mails -
from the Internet - suffer considerable delay. Tracking the problem we found
out that it is caused by the huge amount of spam mails, where the local
domain is correct, but the addressee is wrong so courier gives back an:
550 User unknown
error message. This is all right, the only problem is that this response
arrives after a considerable time. It takes at least 8 secs, but sometimes
even 2 mins.
2 minutes and 8 seconds?
Look at this SMTP dialog:
$ telnet helium.leptonite.de smtp
Trying 85.214.27.32...
Connected to helium.leptonite.de.
Escape character is '^]'.
220 helium.leptonite.de ESMTP
HELO its.me
250 helium.leptonite.de Ok.
MAIL FROM: <ma...@daniel-faber.de>
250 Ok.
RCPT TO: <noth...@leptonite.de>
--- delay: 8 seconds ---
550 User unknown.
RCPT TO: <noth...@leptonite.de>
--- delay: 16 seconds ---
550 User unknown.
RCPT TO: <noth...@leptonite.de>
--- delay: 32 seconds ---
550 User unknown.
RCPT TO: <noth...@leptonite.de>
--- delay: 64 seconds ---
550 User unknown.
RCPT TO: <noth...@leptonite.de>
--- delay: 128 seconds ---
550 User unknown.
My guess: it's not a bug, it's a feature to slow down spammers.
Daniel
13 messages in net.sourceforge.lists.courier-usersRe: [courier-users] Considerable time...
