On 04/09/2022 22:09, Ján Lalinský via Exim-users wrote:
==r...@xyz.com  R=xxx (-36): host lookup for <imap_server> did not
complete (DNS timeout?)

There is no problem with DNS resolution of the relevant domains on those
MX servers whatsover, judging by using dig and host command in shell.

But judging by the error from Exim, there is.  Assuming that this
name-resolution should have used DNS, of course.

<mid> no immediate delivery: more than 10 messages received in one
connection

That's not an error, only informative.
See the main config option smtp_accept_queue_per_connection.

We tried
settings

smtp_accept_max_per_connection = 100
smtp_accept_queue_per_connection = 100

in exim.conf, but to no avail.

Then your daemon is not running that configuration.
Did you restart it, after that edit?
--
Cheers,
  Jeremy


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