如果squirremail未邮件开启smtp认证：
用squirrelmail发送邮件时出现如下提示:
Message not sent. Server replied:
Transaction failed
554 5.7.1 <52********@qq.com>: Relay access denied
进入 squirremail目录 /var/www/html/webmail
config/conf.pl
Main Menu --
1. Organization Preferences
2. Server Settings
3. Folder Defaults
4. General Options
5. Themes
6. Address Books
7. Message of the Day (MOTD)
8. Plugins
9. Database
10. Languages
按照提示选择2
Server Settings
General
-------
1. Domain : localhost.localdomain
2. Invert Time : false
3. Sendmail or SMTP : SMTP
A. Update IMAP Settings : localhost:143 (dovecot)
B. Update SMTP Settings : 127.0.0.1:25
R Return to Main Menu
C Turn color on
S Save data
Q Quit
选择B
Server Settings
General
-------
1. Domain : localhost.localdomain
2. Invert Time : false
3. Sendmail or SMTP : SMTP
SMTP Settings
-------------
4. SMTP Server : 127.0.0.1
5. SMTP Port : 25
6. POP before SMTP : false
7. SMTP Authentication : none 将这个改为login
8. Secure SMTP (TLS) : false
9. Header encryption key :
选择7
Command >> 7
*** YOUR SMTP SERVER MUST SUPPORT THE MECHANISM YOU CHOOSE HERE ***
If you don't understand or are unsure, you probably want "none"
none, login, cram-md5, or digest-md5 [none]: login 将none改为login
SMTP authentication uses IMAP username and password by default.
Would you like to use other login and password for all SquirrelMail
SMTP connections? [y/N]:N
R Return to Main Menu
C Turn color on
S Save data
Q Quit
保存退出后再使用squirrelmail发送邮件就可以了。
