> Hi, I realize this is probably one of the most frequently asked questions, > but I really can't figure out why this was rejected. > > Apr 25 12:06:01 petra postfix-226/smtpd[592344]: NOQUEUE: reject: RCPT from > mail.email.eurobank.rs <http://mail.email.eurobank.rs/>[195.242.76.237]: 450 > 4.1.8 <u...@eurobank-direktna.rs <mailto:u...@eurobank-direktna.rs>>: Sender > address rejected: Domain not found; from=<obaveste...@eurobank-direktna.rs > <mailto:obaveste...@eurobank-direktna.rs>> to=<mi...@example.com > <mailto:mi...@example.com>> proto=ESMTP helo=<mail.email.eurobank-direktna.rs > <http://mail.email.eurobank-direktna.rs/>> > > What am I missing? eurobank-direktna.rs <http://eurobank-direktna.rs/> and > mail.email.eurobank-direktna.rs <http://mail.email.eurobank-direktna.rs/> > both have forward and reverse DNS entries. > > I thought maybe it just didn't resolve properly at the time the email was > received, but it's been happening for hours.
Negative dns answers may be cached but usually not for hours. Verify that the resolver running on the postfix server can resolve that domain because this sounds like a dns problem. https://www.postfix.org/postconf.5.html#reject_unknown_sender_domain Query the resolvers listed in /etc/resolv.conf directly, e.g. dig @127.0.0.1 eurobank-direktna.rs a dig @127.0.0.1 eurobank-direktna.rs mx Alternatively try a public resolver in /etc/resolv.conf: nameserver 8.8.8.8 or nameserver 1.1.1.1 Best regards, Gerald
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