https://bugs.exim.org/show_bug.cgi?id=2454
Bug ID: 2454
Summary: Some Exim configurations send BDAT to a non-pipelining
server that rejects all RCPT commands
Product: Exim
Version: N/A
Hardware: x86
OS: Linux
Status: NEW
Severity: bug
Priority: medium
Component: Delivery in general
Assignee: unallocated@???
Reporter: wietse@???
CC: exim-dev@???
Some Exim configurations send BDAT to a server that does not announce
PIPELINING support, and that has rejected all RCPT TO commands in a mail
transaction.
This causes mail delivery problems with sites that have turned on the
postscreen daemon. This is an optional Postfix feature that looks for dubious
SMTP protocol behavior, such as clients that ignore negative server responses.
Here's a small sample of Exim clients, with the first line of their message
content:
[134.209.47.119]:41000 Received: from [208.115.125.46] (helo=User)\r\n\tby
centos-s-2vcpu-4gb-nyc3-02 with esmtpa (Exim 4.91)\r
[159.89.180.241]:46524 Received: from [102.165.49.98]\r\n\tby
centos-s-2vcpu-4gb-nyc3-03 with esmtpa (Exim 4.91)\r\n\t(envelope-f
[92.53.124.157]:49458 Received: from [37.49.224.187] (helo=User)\r\n\tby
amz-corp.com with smtp (Exim 4.90_1)\r\n\t(envelope-fro
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