=?utf-8?q?K=C4=81rlis_Repsons?=: > After seeing these: > > postfix/smtpd[14497]: warning: 118.71.107.14: hostname adsl-dynamic-pool-x >-xx.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]: 5 >-50 5.1.1 <d...@dd.lv>: Recipient address rejected: User unknown in virtual mai >-lbox 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 spamm >-ing at full speed to nonexistent address all day long? Would logfiles get fl >-ooded or some quota would get exhausted?
The client would have to do repeat this about two million times to fill one gigabyte of logfile space. This is not impossible but it would take some effort. See http://www.postfix.org/TUNING_README.html#conn_limit to set limits on the number of requests a client may make. You can run a logfile watching program that adds a firewall rule or takes some other action when a client is mis-behaving. It would be a bad idea to stop Postfix or to stop logging. Wietse
