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Milos Cuculovic
Asked: 2014-10-29 02:34:19 +0800 CST

Postfix SMTP server gets "550 Requested mail action not taken: Invalid IP"

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I have a SMTP server named smtp-ca.mdpi.com and when sending emails to some specific chinese email domains, I am getting back:

550 Requested mail action not taken: Invalid IP<64.15.147.140> (in reply to end of DATA command))

I have an SPF set in the TXT of the domain. The rDSN is working fine.

Any idea why this happens?

Thank you in advance.

EDIT: Here is the postconf -n configuration

alias_maps = hash:/etc/aliases
append_dot_mydomain = no
biff = no
config_directory = /etc/postfix
inet_interfaces = 127.0.0.1 10.10.0.10
local_transport = error:local delivery is disabled
mailbox_size_limit = 0
message_size_limit = 102400000
myhostname = smtp-ca.mdpi.com
mynetworks = 127.0.0.0/8 10.10.0.0/24
myorigin = /etc/mailname
readme_directory = no
sender_canonical_maps = hash:/etc/postfix/sender_canonical
smtpd_banner = $myhostname ESMTP $mail_name (Debian/GNU)
smtpd_client_restrictions = permit_mynetworks, reject
virtual_alias_maps = hash:/etc/postfix/virtual_aliases
postfix

1 Answers

  1. Best Answer

    Your configuration looks correct and i have checked your Forward and Reverse entries. That look ok. The problem is that you don't know which SPAM-System and RBL the recipient use.

    So its possible that they use a special RBL-List and you are blocked on that list for example. There are a lot of possibilities but i think your configuration is ok.

    Perhaps you can analyse your logs and you get some more informations.

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