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Reorder and simplify first secions of README

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README.md
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# Lacre Project
**Lacre** (wax seal in Portuguese) is an add-on for Postfix that automatically
encrypts incoming email before delivering it to recipients' inbox for
recipients that have provided their public keys.
Lacre is a fork and continuation of the original work on
[gpg-mailgate](https://github.com/TheGreatGooo/gpg-mailgate) project. It is
still actively developed and should be considered as beta -- with all APIs and
internals being subject to change. Please only use this software if you know
GnuPG well and accept occasional failures.
**Lacre** (wax seal in Portuguese) is a
[content filter](https://www.postfix.org/FILTER_README.html)
for Postfix that automatically encrypts incoming email using GnuPG for
recipients that have provided their public keys.
All incoming emails are automatically encrypted with users' public keys before
they are saved in the inbox.
# How it works
When Postfix receives a message, it "forwards" that message to Lacre.
Lacre is a [content filter](https://www.postfix.org/FILTER_README.html). This
means, that when Postfix receives a message, it "forwards" that message to
Lacre and if Lacre delivers it to a given destination, the message arrives to
recipient's inbox.
Then, Lacre does the following:
After receiving the message, Lacre does the following:
1. If message already is encrypted, it just delivers the message immediately.
2. Checks the list of recipients, finds their public keys if any were