Symptoms
When sending an email, the following failure is received where "remoteuser@domain.tld" is the email address you are sending an email to, and "user@domain.tld" is the email address that sent the email:
SMTP error from remote mail server after RCPT TO:<remoteuser@domain.tld>:
450 4.1.8 <user@domain.tld>: Sender address rejected:
Domain not found
Description
This failure occurs when the remote mail server cannot resolve the sender's domain to an IP address.
Workaround
Ensure the sender's domain resolves to an IP address.
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