#987981 exim4: misleading bounce and error message "message is too big (transport limit = 1)"

Package:
exim4
Source:
exim4
Submitter:
Frank Heckenbach
Date:
2021-05-03 07:12:04 UTC
Severity:
normal
#987981#5
Date:
2021-05-03 06:29:54 UTC
From:
To:
When I tried to send a mail, exim sent me this bounce:

  Subject: Mail delivery failed: returning message to sender

  This message was created automatically by mail delivery software.

  A message that you sent could not be delivered to one or more of its
  recipients. This is a permanent error. The following address(es) failed:

    [...]