[Exim] error after LHLO - urgent

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Autor: Philipp Gaschuetz
Datum:  
To: exim-users
Betreff: [Exim] error after LHLO - urgent
Hi all!

we have 2 servers running exim (both on 3.36).

server A forwards all incoming email to Server B.

From time to time we get bounce messages with the following error:

>    SMTP error from remote mailer after LHLO advs1.armourplate.net:
>    host ad1.armourplate.net [195.167.168.92]: 500 Unrecognized command


(these are being generated on server A)

Server A's log say:
------
17c5v3-000ABE-00 <= orders@??? U=root P=armourd-ok S=267355
id=removed

17c5v3-000ABE-00 ** isnprovision2@??? R=bsmtp_router
T=remote_smtp: SMTP error from remote mailer after LHLO
advs1.armourplate.net: host ad1.armourplate.net [195.167.168.92]: 500
Unrecognized command

17c5v3-000ABG-00 <= <> R=17c5v3-000ABE-00 U=exim P=local S=107479

17c5v3-000ABE-00 Error message sent to orders@???

17c5v3-000ABE-00 Completed
--------

Server B's log don't say anything :( (neither reject, nor panic, nor
main logs)

Any help is much appreciated!! getting in trouble :(

Thanks,

Philipp

--
Philipp Gaschuetz <philipp@???>