如何將使用者添加到後綴？

我用 davecot 創建和配置了後綴，一切似乎都正常：

Dec 20 10:31:32 mailer dovecot: master: Warning: Killed with signal 15 (by pid=8470 uid=0 code=kill)
Dec 20 10:33:03 mailer dovecot: master: Dovecot v2.3.7.2 (3c910f64b) starting up for imap, pop3, imap, lmtp, pop3 (core dumps disabled)
Dec 20 10:36:26 mailer dovecot: master: Warning: SIGHUP received - reloading configuration
Dec 20 10:38:18 mailer postfix/postfix-script[8513]: stopping the Postfix mail system
Dec 20 10:38:18 mailer postfix/master[8282]: terminating on signal 15
Dec 20 10:38:24 mailer postfix/postfix-script[9155]: warning: symlink leaves directory: /etc/postfix/./makedefs.out
Dec 20 10:38:24 mailer postfix/postfix-script[9320]: starting the Postfix mail system
Dec 20 10:38:24 mailer postfix/master[9322]: daemon started -- version 3.4.13, configuration /etc/postfix
Dec 20 10:38:29 mailer dovecot: master: Warning: Killed with signal 15 (by pid=9328 uid=0 code=kill)
Dec 20 10:40:01 mailer dovecot: master: Dovecot v2.3.7.2 (3c910f64b) starting up for imap, pop3, lmtp, imap, lmtp, pop3 (core dumps disabled)

配置了mx記錄和域本身的記錄。檢查了https://mxtoolbox.com上的所有內容

如何測試發送和接收電子郵件？

如何創建使用者？

我可以將消息發送到其他伺服器，例如 gmail 嗎？

後綴配置：

# See /usr/share/postfix/main.cf.dist for a commented, more complete version


# Debian specific:  Specifying a file name will cause the first
# line of that file to be used as the name.  The Debian default
# is /etc/mailname.
#myorigin = /etc/mailname

smtpd_banner = $myhostname ESMTP $mail_name (Ubuntu)
biff = no

# appending .domain is the MUA's job.
append_dot_mydomain = no

# Uncomment the next line to generate "delayed mail" warnings
#delay_warning_time = 4h

readme_directory = no

# See http://www.postfix.org/COMPATIBILITY_README.html -- default to 2 on
# fresh installs.
compatibility_level = 2



# TLS parameters
smtpd_tls_cert_file=/etc/ssl/certs/certificate.crt
smtpd_tls_key_file=/etc/ssl/private/private.key
smtpd_tls_security_level=may

smtp_tls_CApath=/etc/ssl/certs
smtp_tls_security_level=may
smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache


smtpd_relay_restrictions = permit_mynetworks permit_sasl_authenticated defer_unauth_destination
myhostname = mydomain.xyz
alias_maps = hash:/etc/aliases
alias_database = hash:/etc/aliases
myorigin = /etc/mailname
mydestination = mydomain.xyz, mailer.mydomain.xyz, localhost.mydomain.xyz, , localhost
relayhost =
#mynetworks = 127.0.0.0/8 10.0.0.0/8 172.0.0.0/8 [::]/128 [::ffff:127.0.0.0]/104 [::1]/128
mynetworks = 0.0.0.0/0 , 127.0.0.0/8
mailbox_command =
mailbox_size_limit = 0
recipient_delimiter = +
inet_interfaces = all
inet_protocols = ipv4
home_mailbox = Maildir/
virtual_alias_maps = hash:/etc/postfix/virtual
smtpd_use_tls = yes
mynetworks_style = subnet

大致有兩種創建電子郵件使用者的途徑：

1. PAM 集成，其中 OS (Linux) 使用者（也可以登錄到例如桌面的使用者，使用 ssh，具有唯一的主目錄和 UID 號等）也使用相同的帳戶/憑據來發送電子郵件。除了“ login@[hostname.]example.com”樣式的電子郵件地址之外，您還可以關聯特定的附加電子郵件地址。
2. 僅用於發送和接收電子郵件但沒有作業系統帳戶的“虛擬使用者”。參見例如https://doc.dovecot.org/configuration_manual/howto/simple_virtual_install/

引用自：https://serverfault.com/questions/1087796