Im reading through rfc's but the following is still not clear for me. 
E-mail is rejected base on the envelop-from adres from a mail-daemon with 
postfix + postfix-policyd-spf 
I saw the following in the postfix logs. 
Feb  7 00:00:16 hostname postfix/smtpd[31726]: Untrusted TLS connection 
established from smtp1.xxxxxxxx.nl[x.xx.xxx.xx]: TLSv1.2 with cipher 
ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)
Feb  7 00:00:16 hostname postfix/policy-spf[31766]: Policy action=PREPEND 
Received-SPF: none (apmcsqa01.poort: No applicable sender policy available) 
receiver=hostname.domain.nl; identity=mailfrom; 
envelope-from="MAILER-DAEMON@apmcsqa01.poort"; helo=smtp1.xxxxxxxx.nl; 
Feb  7 00:00:16 hostname postfix/smtpd[31726]: NOQUEUE: reject: RCPT from 
smtp1.xxxxxxxx.nl[x.xx.xxx.xx]]: 450 4.1.8 <MAILER-DAEMON@apmcsqa01.poort>: 
Sender address rejected: Domain not found; from=<MAILER-DAEMON@apmcsqa01.poort> 
about this: 
Im looking for the correct rfc where its described that the part 
@apmcsqa01.poort  should be @thesendingdomain.tld 
where thesendingdomain.tld is also a resolvable domain, because not it does not 
make sence because the now mailer-daemon wil never be accepted because its non 
If some can point me to the correct rfc. ( and chapter ) that would be great. 

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