After the mailbox of the Pagoda Post Office is successfully set up, it can be sent but not received.

Today I used the Pagoda Post Office to build a mailbox by myself. After success, I found that I could only receive mail but not send mail. Check the log

 User doesn't exist: [email protected]****.com (in reply to RCPT TO command))warning: E9B1C43064: undeliverable postmaster notification discarded

Add one directly as postmaster

Users, problem solved, send again, found new problems,

warning: No server certs available. TLS won't be enabled

Generate certificate

cd /etc/postfixsudo openssl req -new -outform PEM -out smtpd.cert -newkey rsa:2048 -nodes -keyout smtpd.key -keyform PEM -days 365 -x509

Then modify the configuration file and add the following configuration at the bottom

smtpd_enforce_tls = nosmtpd_tls_loglevel = 1smtpd_use_tls = yessmtpd_tls_key_file = /etc/postfix/smtpd.keysmtpd_tls_cert_file = /etc/postfix/smtpd.cert

Restart the service, send and receive everything is normal, get it!