Minor typo:

postconf -e smtp_discard_ehlo_keywords=size

then postfix reload.





On 10/10/2019 10:37 AM, Tobias Köck wrote:
Hi,

got it. Thanks.

Btw. for some reason for Postfix: 2.6.6

[root@icinga2 icinga2]# postconf smtp_discard_ehlo_keywords=size
postconf: warning: smtp_discard_ehlo_keywords=size: unknown parameter

it doesn't seem to know the parameter. Strange but maybe you might want to know.

Greetings
Tobias

On 10/10/19 5:16 PM, Wietse Venema wrote:
Tobias K?ck:
Hi,

I have a Postfix set up to relay the messages to an Exchange server.

It declines the mails with

ntern_mail.someurl.de,08D7265A6F30DBE4,12,10.32.68.13:2525,10.32.66.152:49726,*,Tarpit for '0.00:00:05' due to '550 5.7.61 SMTP; Anonymous client does not have
permissions to send as this sender',

There are many responses when I search the web for that.

It works manually with telnet mail.someurl.de.

 From the same IP address that Postfix is using?

I suspect it is because Postfix send in the Envelope address for some
reason the SIZE=423 with it

MAIL FROM:<tko...@someurl.de> SIZE=434,

How can I disable the sending of the SIZE parameter?

postconf smtp_discard_ehlo_keywords=size
postfix reload

But that is just to convince yourself that size does not matter.
It will also waste bandwidth when an email message is large.

    Wietse


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