Github user sebbASF commented on the issue:
https://github.com/apache/incubator-ponymail/issues/188
A sample mail is available at:
https://lists.apache.org/thread.html/193753a67ae187b52563c45bd1b62b38a4f763f9c56c4672e9f133a1@%3Cissues.infra.apache.org%3E
Note that the corresponding mod_mbox export does correctly escape these
lines.
[However it fails to unescape the lines for display (oops!):
http://mail-archives.apache.org/mod_mbox/infra-issues/201610.mbox/%3CJIRA.13011963.1476360688000.72524.1477350240050%40Atlassian.JIRA%3E]
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