Mail bounced due to "host relayserver[xx.xx.xx.xx] said: 503 5.5.1 Error: need MAIL command - MAIL FROM error: 451 4.7.1 Service unavailable - try again later (in reply to RCPT TO command)" message.
Issue
- Mail bounced due to "host relayserver[xx.xx.xx.xx] said: 503 5.5.1 Error: need MAIL command - MAIL FROM error: 451 4.7.1 Service unavailable - try again later (in reply to RCPT TO command)" message.
Environment
- Red Hat Enterprise Linux 7
- postfix
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