rainloop是出了名的简单，好用，速度快，但是支持的功能却有点少，但还是可以用于日常收发的！

https://www.rainloop.net/docs/installation/

安装步骤：

在lnmp环境上

我是新建了一个mail.ramuel.com 这样的域名

且：我postfixadmin，搭建的域名用的是ramuel

imap用imap.ramuel.com

smtp用smtp.ramuel.com

下载安装

wget https://www.rainloop.net/repository/webmail/rainloop-latest.zip
unzip rainloop-latest.zip -d /home/wwwroot/mail.ramuel.com
然后ningx配置文件/usr/local/nginx/conf/vhost/mail.ramuel.com.conf
根据官方需要在nginx添加一个运行目录

location ^~ /data {
deny all;
}

然后更加官方的规定还要修改两个目录的权限
find /home/wwwroot/mail.ramuel.com -type d -exec chmod 755 {} \;
find /home/wwwroot/mail.ramuel.com -type f -exec chmod 644 {} \;
chown -R www:www mail.wphlod.com
http://mail.ramuel.com/?admin
就可以访问了账号是admin密码12345
接下来就是一些修改，配置数据库，添加域名，你可以在admin那边登录设置，也可以直接修改添加这两个配置文件
mail.ramuel.com/data/_data_/_default_/configs/application.ini

; RainLoop Webmail configuration file

; Please don't add custom parameters here, those will be overwritten

[webmail]
; Text displayed as page title
title = "RainLoop Webmail"

; Text displayed on startup
loading_description = "RainLoop"
favicon_url = ""

; Theme used by default
theme = "Default"

; Allow theme selection on settings screen
allow_themes = On
allow_user_background = Off

; Language used by default
language = "zh_CN"

; Admin Panel interface language
language_admin = "zh_CN"

; Allow language selection on settings screen
allow_languages_on_settings = On
allow_additional_accounts = On
allow_additional_identities = On

;  Number of messages displayed on page by default
messages_per_page = 20

; File size limit (MB) for file upload on compose screen
; 0 for unlimited.
attachment_size_limit = 25

[interface]
show_attachment_thumbnail = On
use_native_scrollbars = Off
new_move_to_folder_button = On

[branding]
login_logo = ""
login_background = ""
login_desc = ""
login_css = ""
user_css = ""
user_logo = ""
user_logo_title = ""
user_logo_message = ""
user_iframe_message = ""
welcome_page_url = ""
welcome_page_display = "none"

[contacts]
; Enable contacts
enable = On
allow_sync = On
sync_interval = 20
type = "mysql"
pdo_dsn = "mysql:host=127.0.0.1;port=3306;dbname=rainloop"
pdo_user = "rainloop"
pdo_password = "sql-password"
suggestions_limit = 30

[security]
; Enable CSRF protection (http://en.wikipedia.org/wiki/Cross-site_request_forgery)
csrf_protection = On
custom_server_signature = "RainLoop"
x_frame_options_header = ""
x_xss_protection_header = "1; mode=block"
openpgp = Off

; Login and password for web admin panel
admin_login = "admin"
admin_password = "12345"

; Access settings
allow_admin_panel = On
allow_two_factor_auth = Off
force_two_factor_auth = Off
hide_x_mailer_header = Off
admin_panel_host = ""
admin_panel_key = "admin"
content_security_policy = ""
core_install_access_domain = ""

[ssl]
; Require verification of SSL certificate used.
verify_certificate = Off

; Allow self-signed certificates. Requires verify_certificate.
allow_self_signed = On

; Location of Certificate Authority file on local filesystem (/etc/ssl/certs/ca-certificates.crt)
cafile = ""

; capath must be a correctly hashed certificate directory. (/etc/ssl/certs/)
capath = ""

; Location of client certificate file (pem format with private key) on local filesystem
client_cert = ""

[capa]
folders = On
composer = On
contacts = On
settings = On
quota = On
help = On
reload = On
search = On
search_adv = On
filters = On
x-templates = Off
dangerous_actions = On
message_actions = On
messagelist_actions = On
attachments_actions = On

[login]
default_domain = "wphlod.com"

; Allow language selection on webmail login screen
allow_languages_on_login = On
determine_user_language = On
determine_user_domain = On
welcome_page = Off
hide_submit_button = On
forgot_password_link_url = ""
registration_link_url = ""
login_lowercase = On

; This option allows webmail to remember the logged in user
; once they closed the browser window.
; 
; Values:
;   "DefaultOff" - can be used, disabled by default;
;   "DefaultOn"  - can be used, enabled by default;
;   "Unused"     - cannot be used
sign_me_auto = "DefaultOff"

[plugins]
; Enable plugin support
enable = Off

; List of enabled plugins
enabled_list = ""

[defaults]
; Editor mode used by default (Plain, Html, HtmlForced or PlainForced)
view_editor_type = "Html"

; layout: 0 - no preview, 1 - side preview, 2 - bottom preview
view_layout = 1
view_use_checkboxes = On
autologout = 30
show_images = Off
contacts_autosave = On
mail_use_threads = Off
allow_draft_autosave = On
mail_reply_same_folder = Off

[logs]
; Enable logging
enable = Off

; Logs entire request only if error occured (php requred)
write_on_error_only = Off

; Logs entire request only if php error occured
write_on_php_error_only = Off

; Logs entire request only if request timeout (in seconds) occured.
write_on_timeout_only = 0

; Required for development purposes only.
; Disabling this option is not recommended.
hide_passwords = On
time_offset = "0"
session_filter = ""
sentry_dsn = ""

; Log filename.
; For security reasons, some characters are removed from filename.
; Allows for pattern-based folder creation (see examples below).
; 
; Patterns:
;   {date:Y-m-d}  - Replaced by pattern-based date
;                   Detailed info: http://www.php.net/manual/en/function.date.php
;   {user:email}  - Replaced by user's email address
;                   If user is not logged in, value is set to "unknown"
;   {user:login}  - Replaced by user's login (the user part of an email)
;                   If user is not logged in, value is set to "unknown"
;   {user:domain} - Replaced by user's domain name (the domain part of an email)
;                   If user is not logged in, value is set to "unknown"
;   {user:uid}    - Replaced by user's UID regardless of account currently used
; 
;   {user:ip}
;   {request:ip}  - Replaced by user's IP address
; 
; Others:
;   {imap:login} {imap:host} {imap:port}
;   {smtp:login} {smtp:host} {smtp:port}
; 
; Examples:
;   filename = "log-{date:Y-m-d}.txt"
;   filename = "{date:Y-m-d}/{user:domain}/{user:email}_{user:uid}.log"
;   filename = "{user:email}-{date:Y-m-d}.txt"
filename = "log-{date:Y-m-d}.txt"

; Enable auth logging in a separate file (for fail2ban)
auth_logging = Off
auth_logging_filename = "fail2ban/auth-{date:Y-m-d}.txt"
auth_logging_format = "[{date:Y-m-d H:i:s}] Auth failed: ip={request:ip} user={imap:login} host={imap:host} port={imap:port}"

[debug]
; Special option required for development purposes
enable = Off

[social]
; Google
google_enable = Off
google_enable_auth = Off
google_enable_auth_gmail = Off
google_enable_drive = Off
google_enable_preview = Off
google_client_id = ""
google_client_secret = ""
google_api_key = ""

; Facebook
fb_enable = Off
fb_app_id = ""
fb_app_secret = ""

; Twitter
twitter_enable = Off
twitter_consumer_key = ""
twitter_consumer_secret = ""

; Dropbox
dropbox_enable = Off
dropbox_api_key = ""

[cache]
; The section controls caching of the entire application.
; 
; Enables caching in the system
enable = On

; Additional caching key. If changed, cache is purged
index = "v1"

; Can be: files, APC, memcache, redis (beta)
fast_cache_driver = "files"

; Additional caching key. If changed, fast cache is purged
fast_cache_index = "v1"

; Browser-level cache. If enabled, caching is maintainted without using files
http = On

; Browser-level cache time (seconds, Expires header)
http_expires = 3600

; Caching message UIDs when searching and sorting (threading)
server_uids = On

[labs]
; Experimental settings. Handle with care.
; 
allow_mobile_version = On
ignore_folders_subscription = Off
check_new_password_strength = On
update_channel = "stable"
allow_gravatar = On
allow_prefetch = On
allow_smart_html_links = On
cache_system_data = On
date_from_headers = On
autocreate_system_folders = On
allow_message_append = Off
disable_iconv_if_mbstring_supported = Off
login_fault_delay = 1
log_ajax_response_write_limit = 300
allow_html_editor_source_button = Off
allow_html_editor_biti_buttons = Off
allow_ctrl_enter_on_compose = On
try_to_detect_hidden_images = Off
hide_dangerous_actions = Off
use_app_debug_js = Off
use_mobile_version_for_tablets = Off
use_app_debug_css = Off
use_imap_sort = On
use_imap_force_selection = Off
use_imap_list_subscribe = On
use_imap_thread = On
use_imap_move = Off
use_imap_expunge_all_on_delete = Off
imap_forwarded_flag = "$Forwarded"
imap_read_receipt_flag = "$ReadReceipt"
imap_body_text_limit = 555000
imap_message_list_fast_simple_search = On
imap_message_list_count_limit_trigger = 0
imap_message_list_date_filter = 0
imap_message_list_permanent_filter = ""
imap_message_all_headers = Off
imap_large_thread_limit = 50
imap_folder_list_limit = 200
imap_show_login_alert = On
imap_use_auth_plain = On
imap_use_auth_cram_md5 = Off
smtp_show_server_errors = Off
smtp_use_auth_plain = On
smtp_use_auth_cram_md5 = Off
sieve_allow_raw_script = Off
sieve_utf8_folder_name = On
sieve_auth_plain_initial = On
sieve_allow_fileinto_inbox = Off
imap_timeout = 300
smtp_timeout = 60
sieve_timeout = 10
domain_list_limit = 99
mail_func_clear_headers = On
mail_func_additional_parameters = Off
favicon_status = On
folders_spec_limit = 50
owncloud_save_folder = "Attachments"
owncloud_suggestions = On
curl_proxy = ""
curl_proxy_auth = ""
in_iframe = Off
force_https = Off
custom_login_link = ""
custom_logout_link = ""
allow_external_login = Off
allow_external_sso = Off
external_sso_key = ""
http_client_ip_check_proxy = Off
fast_cache_memcache_host = "127.0.0.1"
fast_cache_memcache_port = 11211
fast_cache_redis_host = "127.0.0.1"
fast_cache_redis_port = 6379
use_local_proxy_for_external_images = Off
detect_image_exif_orientation = On
cookie_default_path = ""
cookie_default_secure = Off
check_new_messages = On
replace_env_in_configuration = ""
startup_url = ""
strict_html_parser = Off
allow_cmd = Off
dev_email = ""
dev_password = ""

[version]
current = "1.16.0"
saved = "Sun, 03 Apr 2022 03:34:14 +0000"

下面这个看清楚，是一级域名！即@ramuel.com 这样的用户登录域名
mail.ramuel.com/data/_data_/_default_/domains/wphlod.com.ini

imap_host = "imap.ramuel.com"
imap_port = 143
imap_secure = "None"
imap_short_login = Off
sieve_use = Off
sieve_allow_raw = Off
sieve_host = ""
sieve_port = 4190
sieve_secure = "None"
smtp_host = "smtp.ramuel.com"
smtp_port = 25
smtp_secure = "None"
smtp_short_login = Off
smtp_auth = On
smtp_php_mail = Off
white_list = ""

最后你就可以登录你在postfixadmin上面建立的邮箱了，快来试试吧