bors[bot] 9c57f2ac39 Merge #1785 ... 1785: Fix bug #1660 (don't replace nested headers) r=mergify[bot] a=nextgens ## What type of PR? bug-fix ## What does this PR do? Don't replace nested headers (typically in forwarded/attached emails). This will ensure we don't break cryptographic signatures. ### Related issue(s) - close #1660 ## Prerequistes Before we can consider review and merge, please make sure the following list is done and checked. If an entry in not applicable, you can check it or remove it from the list. - [x] Unless it's docs or a minor change: add [changelog](https://mailu.io/master/contributors/guide.html#changelog) entry file. Co-authored-by: Florent Daigniere <nextgens@freenetproject.org>		4 years ago
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1607.feature	add towncrier for #1607	5 years ago
1610.feature	add towncrier for 1610	5 years ago
1618.feature	add newsfragemnt for #1618	5 years ago
1638.fix	Add changelog	4 years ago
1660.bugfix	towncrier	4 years ago
1662.feature	Improve the towncrier messages	4 years ago
1669.bugfix	Fix extract_host_port port separation	4 years ago
1686.bugfix	Fix letsencrypt access to certbot for the mail-letsencrypt flavour	4 years ago
1696.misc	fix changelog entry from feature to misc	4 years ago
1712.misc	Add newsfragment	4 years ago
1720.bugfix	Use alpine 3.13 to fix CVE-2020-25275 and CVE-2020-24386	4 years ago
1753.feature	Improve the towncrier messages	4 years ago
1783.misc	towncrier	4 years ago