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: <[EMAIL PROTECTED]> 250 Ok. RCPT TO: <[EMAIL PROTECTED]> --- delay: 8 seconds --- 550 User unknown. RCPT TO: <[EMAIL PROTECTED]> --- delay: 16 seconds --- 550 User unknown. RCPT TO: <[EMAIL PROTECTED]> --- delay: 32 seconds --- 550 User unknown. RCPT TO: <[EMAIL PROTECTED]> --- delay: 64 seconds --- 550 User unknown. RCPT TO: <[EMAIL PROTECTED]> --- delay: 128 seconds --- 550 User unknown. My guess: it's not a bug, it's a feature to slow down spammers. Daniel
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