https://bugs.exim.org/show_bug.cgi?id=2903
Bug ID: 2903
Summary: Rewrite rules in 4.96 cause SMTP connections to drop
Product: Exim
Version: 4.96
Hardware: x86
OS: Linux
Status: NEW
Severity: bug
Priority: medium
Component: Delivery in general
Assignee: unallocated@???
Reporter: dpc22@???
CC: exim-dev@???
We upgraded to Exim 4.96 last week.
This morning I received a couple of reports that specific incoming email were
stuck because Exim was dropping connections in the middle of the SMTP
transaction. A bit of trial and error reveals that this happens if (at least)
any of the From:, To: and Reply-To headers in a message have an invalid value
which doesn't include a valid email address.
Unfortunately I didn't pick this up when running the final Exim 4.96 Release
Candidate.
Example cut and pasted from a manual SMTP test:
MAIL FROM:<dpc22@???>
250 OK
RCPT TO:<dpc22@???>
250 Accepted
DATA
354 Enter message, ending with "." on a line by itself
From: <dpc22@>
Connection closed by foreign host.
Another example was the following:
From: Sender Name
To: Recipient Name
Repeated subdivisions on my Exim configuration file reveals that the culprit
is:
begin rewrite
*@*.hermes.cam.ac.uk $1@??? hF
which we no longer need (that service has been shut down). However this works
in 4.95. Things start to work again if I comment out the single rewrite rule.
One of our departments ran into exactly the same issue when they upgraded Exim
a few days before us.
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