Dec 19 04:51:05 mail postfix/submission/smtpd[24088]: NOQUEUE: reject: RCPT from c-24-6-111-204.hsd1.ca.comcast.net[24.6.111.204]: 554 5.7.1 <c-24-6-111-204.hsd1.ca.comcast.net[24.6.111.204]>: Client host rejected: Access denied; from=<info@myserver.com> to=<info@ myserver.com> proto=ESMTP helo=<192.168.88.12>

$ postconf mynetworks
mynetworks = 127.0.0.0/8 [::1]/128 10.1.0.0/16 64.71.111.112/28 24.6.111.204/32 192.168.88.0/24

mail.smtp.port = 587
mail.smtp.auth = true
mail.smtp.starttls.enable = true
mail.user = 'info@myserver.com'
mail.smtp.password = 'thepassword'