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Linux Mastering Development

Unable to send mail to a domain outside my own domain

Everything was running smoothly until the Dovecot version got updated to 2.3.8 on my CentOS 8 server or at least that’s when I start noticing it. Inbound mails are fine and transactional mails from my WordPress site are also sending. I am using Postfix, Dovecot and virtual mailboxes via PostfixAdmin. These are the content of the maillog:

Jun 30 13:34:10 bluesky postfix/smtp[950050]: error: open /etc/postfix/smtp_header_checkssmtp_address_preference: No such file or directory
Jun 30 13:34:10 bluesky postfix/smtp[950050]: fatal: open dictionary: expecting "type:name" form instead of "="
Jun 30 13:34:11 bluesky postfix/master[811267]: warning: process /usr/libexec/postfix/smtp pid 950050 exit status 1
Jun 30 13:34:11 bluesky postfix/master[811267]: warning: /usr/libexec/postfix/smtp: bad command startup — throttling

The only change I did since the Dovecot update was the ssl_dh parameter since it complained about the length and about not supporting SSL – if this has something to do with the issue…

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