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Mar 23 18:31:25 smtp postfix/smtp[3216]: 568184B8D25C: to=<an_email@a_domain.com>, relay=lunamira.com[208.113.151.171], delay=0, status=bounced (host lunamira.com[208.113.151.171] said: 554 <an_email@a_domain.com>: Relay access denied (in reply to RCPT TO command))
Having some problems with my postfix and sending mail via remote SMTP client. Keeping getting this in my logs
Either you, or a spammer, is trying to send mail using your server, but they are not specified as a valid mail user (their from domain) so your mail server rejects them.
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