Hi,

Just followed this guide to configure a mail server on centos7

I am using Thunderbird as my client, whenever I attempt to send an email I get prompted with:
Sending of messaged failed.
The message could not be sent because the connection to SMTP server mail.dha.com timed out.

Below is the maillog:

Jun 3 18:04:49 mail postfix/smtps/smtpd[6158]: warning: cannot get RSA certificate from file /etc/postfix/ssl/server.crt: disabling TLS support
Jun 3 18:04:49 mail postfix/smtps/smtpd[6158]: warning: TLS library problem: 6158:error:02001002:system library:fopen:No such file or directory:bss_file.c:398:fopen('/etc/postfix/ssl/server.crt','r'):
Jun 3 18:04:49 mail postfix/smtps/smtpd[6158]: warning: TLS library problem: 6158:error:20074002:BIO routines:FILE_CTRL:system lib:bss_file.c:400:
Jun 3 18:04:49 mail postfix/smtps/smtpd[6158]: warning: TLS library problem: 6158:error:140DC002:SSL routines:SSL_CTX_use_certificate_chain_file:system lib:ssl_rsa.c:722:
Jun 3 18:04:49 mail postfix/smtps/smtpd[6158]: connect from mail.isis.com[10.128.4.32]
Jun 3 18:06:30 mail postfix/smtps/smtpd[6158]: lost connection after UNKNOWN from mail.dha.com[10.128.4.32]
Jun 3 18:06:30 mail postfix/smtps/smtpd[6158]: disconnect from mail.dha.com[10.128.4.32]


I revisited the guide for the SSL keys and certs multiple times to ensure they are correct but I cant figure out the issue.
Thank you.

Not a big fan of postfix, rather use exim or sendmail. That said, the error in your logs are in /etc/postfix/ssl/server.crt You might want to look at the file ownership verse the user reported to run postfix in ps to ensure the file is readable? Otherwise look at using the openssl to decrypt the certificate to ensure it is operating correctly?

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