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Upgrade iRedMail from 1.4.0 to 1.4.1

[TOC]

!!! warning

THIS IS A DRAFT DOCUMENT, DO NOT APPLY IT.

!!! note "Paid Remote Upgrade Support"

We offer remote upgrade support if you don't want to get your hands dirty,
check [the details](https://www.iredmail.org/support.html) and
[contact us](https://www.iredmail.org/contact.html).

ChangeLog

Jul 23, 2021: initial draft document.

General (All backends should apply these changes)

Update `/etc/iredmail-release` with new iRedMail version number

iRedMail stores the release version in /etc/iredmail-release after installation, it's recommended to update this file after you upgraded iRedMail, so that you can know which version of iRedMail you're running. For example:

1.4.1

Amavisd: Add some useful ban rules

Microsoft Office documents are banned with iRedMail default settings, but it's common that some mailbox may need to receive such documents.

Here we define some ban rules to allow these Office document types, iRedMail server admin can update per-user spam policy to allow receiving such documents.

Update Amavisd config file and append these lines before the last line (1;):
- on RHEL/CentOS/Rocky Linux, it's /etc/amavisd/amavisd.conf.
- on Debian/Ubuntu, it's /etc/amavis/conf.d/50-user.
- on FreeBSD, it's /usr/local/etc/amavisd.conf.
- on OpenBSD, it's /etc/amavisd/amavisd.conf.

# Define some useful rules.
%banned_rules = (
    # Allow all Microsoft Office documents.
    'ALLOW_MS_OFFICE'   => new_RE([qr'.\.(doc|docx|xls|xlsx|ppt|pptx)$'i => 0]),

    # Allow Microsoft Word, Excel, PowerPoint documents separately.
    'ALLOW_MS_WORD'     => new_RE([qr'.\.(doc|docx)$'i => 0]),
    'ALLOW_MS_EXCEL'    => new_RE([qr'.\.(xls|xlsx)$'i => 0]),
    'ALLOW_MS_PPT'      => new_RE([qr'.\.(ppt|pptx)$'i => 0]),

    # Default rule.
    'DEFAULT' => $banned_filename_re,
);

Restarting Amavisd service is required.

Here we defines 5 ban rules:

ALLOW_MS_OFFICE: Allow all Microsoft Office documents.
ALLOW_MS_WORD: Allow Microsoft Word documents (.doc, .docx).
ALLOW_MS_EXCEL: Allow Microsoft Excel documents (.xls, .xlsx).
ALLOW_MS_PPT: Allow Microsoft PowerPoint documents (.ppt, .pptx).
DEFAULT: use the default ban rule defined in $banned_filename_re.

You're free to define more ban rules to fit your own needs.

!!! attention

#### Example: How to use these ban rules

If you already define per-user, per-domain, or global spam policy with
iRedAdmin-Pro or manually, you can now assign these ban rules to them.

For example, if you have spam policy for user `user@domain.com`, to allow
this user to accept Microsoft Word and Excel documents, you can run SQL
commands below to achieve it (Note: we use MySQL for example):

    USE amavisd;
    UPDATE policy SET banned_rulenames="ALLOW_MS_WORD,ALLOW_MS_EXCEL" WHERE policy_name="user@domain.com";

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