On Dec 12, 2009, at 6:28 PM, Kārlis Repsons wrote: > After seeing these: > > postfix/smtpd[14497]: warning: 118.71.107.14: hostname > adsl-dynamic-pool-xxx.fpt.vn verification failed: Name or service not known > postfix/smtpd[14497]: connect from unknown[118.71.107.14] > postfix/smtpd[14497]: NOQUEUE: reject: RCPT from unknown[118.71.107.14]: 550 > 5.1.1 <d...@dd.lv>: Recipient address rejected: User unknown in virtual > mailbox table; from=<d...@dd.lv> > to=<d...@dd.lv> proto=SMTP helo=<adsl-dynamic-pool-xxx.fpt.vn> > > in my logfiles, I got curious: what would happen, if anyone keeps on spamming > at full speed to nonexistent address all day long? Would logfiles get flooded > or some quota would get exhausted?
Yes and no. You could something like fail2ban to block hosts which try to spam you too much. I use fail2ban and block host for 10 minutes that produce too many 550 rejects. -- Martijn
