On 12/06/14 11:25, Jelle Raaijmakers wrote:
 The icing on the
cake: if I enable debugging in acl_smtp_mail, the problem goes away!

warn
  condition = ${if match
{$sender_address}{\N(bounce|mailer|notification|alert)\N}}
  control = debug/tag=.$sender_host_address/opts=+all

If you can set up a reproducer mail-from it'll be worth
comparing with debug turned on by a commandline option.

I assume by "problem goes away" you mean that such mails
are properly delivered?

Is the effect repeatable for a given seen-bad mail-from,
if you manually insert a test using "swaks"?   How about
-bh and (if needed) -oMi ?

> It usually happens with addresses containing equals signs (=), pluses
> (+) or hyphens/dashes (-).

Are there definite cases not involving those characters?

Does the config have any customised (over the baseline Exim,
so including anything Debian do) name affix (prefix or suffix)
manipulation?

--
Cheers,
   Jeremy


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