#1109684 exim4-daemon-heavy: Fails to process email if local_host_whitelist contains a non-hostname

Package:
exim4-config
Source:
exim4-config
Submitter:
Date:
2025-07-22 17:33:02 UTC
Severity:
normal
#1109684#5
Date:
2025-07-21 21:57:44 UTC
From:
To:
Dear Maintainer,
 There are a few sites that send badly-formatted emails that I want to accept
 (banks that send bad dates in autogenerated email, for example).
 I have these listed in /etc/exim4/local_host_whitelist

 If _any_ host listed in local_host_whitelit cannot be found in DNS, then
 _all_ email received by the exim4 daemon is 'temporarily rejected'; with
  no useful log message.

Log messages like:
2025-07-22 00:01:15 H=mxphxpool2076.ebay.com [66.211.185.239] X=TLS1.3:ECDHE_X25519__ECDSA_SECP256R1_SHA256__AES_256_GCM:256 CV=no F=<ebay@ebay.com> temporarily rejected RCPT <person@example.com>



  The only way I've found to debug this is to use exim4 -bh and see what the log messages say.

I suggest adding '+ignore_unknown' in the ACL to fix this.