Re: Mailflooding?

[Sascha Reißner <reiszner@novaplan.at>]

Am Freitag, den 31.07.2009, 18:18 +0200 schrieb Heiko Schlittermann:
> Im übrigen ist es zulässig, im HELO eine nur IP zu verwenden. (Wobei
> mir
> jetzt aber nicht ganz klar ist, ob als [aaa.bbb.ccc.ddd] oder auch als
> aaa.bbb.ccc.ddd.)

Soweit ich weis, muß es in [...] stehen.

Auszug aus RFC 5321:

4.1.1.1.  Extended HELLO (EHLO) or HELLO (HELO)

   These commands are used to identify the SMTP client to the SMTP
   server.  The argument clause contains the fully-qualified domain name
   of the SMTP client, if one is available.  In situations in which the
   SMTP client system does not have a meaningful domain name (e.g., when
   its address is dynamically allocated and no reverse mapping record is
   available), the client SHOULD send an address literal (see
   Section 4.1.3).

Und weiter:

4.1.3.  Address Literals

   Sometimes a host is not known to the domain name system and
   communication (and, in particular, communication to report and repair
   the error) is blocked.  To bypass this barrier, a special literal
   form of the address is allowed as an alternative to a domain name.
   For IPv4 addresses, this form uses four small decimal integers
   separated by dots and enclosed by brackets such as [123.255.37.2],
   which indicates an (IPv4) Internet Address in sequence-of-octets
   form.

IPv4-Adressen müssen also in eckigen Klammern stehen.

Gruß Sascha