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Original geschrieben von m@rio
ehlo irgendwas

Das ist so nicht richtig. RFC 2821 definiert ganz genau, was nach dem EHLO zu stehen hat:

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 field 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), optionally followed by information that will help to identify
the client system.

ftp://ftp.rfc-editor.org/in-notes/rfc2821.txt