attack
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... might result in problems for the DNS server itself to cope with
the load. This itself can result in a denial of service attack
against the DNS server just by sending email ...
... DNS, forged
DNS responses can be used to mount denial of service attacks.
For example, if a site is known to implement a FQDN validity ...
... check on addresses in SMTP "MAIL From:" commands, an attacker may
be able to use negative DNS responses to effectively block
...
... verifies that incoming responses correspond to outstanding
queries, to minimize the risk for such attacks.
...
... It should be noted that by logging more events, especially denied
email, one opens the possibility for denial of service attacks, for
example by filling logs by having a very large amount of "RCPT To:"
commands. An implementation that implements increased logging
...
... commands. An implementation that implements increased logging
according to this description must be aware of the fact that the size
of the logfiles increases, especially during attacks.
...
... the ability to block a certain user or a certain domain is quite
helpful while an attack has just been discovered and is ongoing.
...
... If we are under a spam attack it may help us considerably just
being able to slow down the incoming mail rate for that
particular user/host ...
... MTA will re-run its mail queue, which may be
quite costly and open for Denial of Service attacks. Therefore, the
MTA SHOULD control who is is allowed to issue the ETRN ...
... methods
described in this document will, because of that, increase the risk
of a denial of service attack against the support system by sending
spam to a site. Logging facilities must for example be able to handle
...