posfix 無法寄信

3個問題
1. Helo command rejected: need fully-qualified hostname
A: relay_domains = 加入 mail.xxx.com

2.SASL CRAM-MD5 authentication failed: authentication failure
A: 這個是 Client 那邊 密碼規則錯誤

3 .warning: SASL authentication problem: unable to open Berkeley db /etc/sasldb2: No such file or directory
A: vi /etc/sasl2/smtpd.conf pwckeck_method: xxxxx xxxx改為 pwckeck_method:plain login

4. reject: RCPT from unknown[ipv4]: 554 5.7.1 : Relay access denied
A:smtpd_client_restrictions = permit_sasl_authenticated