Fix courier imapd.pem error PEM routines no start line

Error courier imapd.pem file

tailf /var/log/mail.log
imapd-ssl: couriertls: /etc/courier/imapd.pem: error:0906D06C:PEM routines:PEM_read_bio:no start line

How to fix

vim /etc/courier/imapd-ssl

##NAME: TLS_DHPARAMS:0
#
# TLS_DHPARAMS - DH parameter file.
#
TLS_DHPARAMS=/etc/courier/dhparams.pem

/etc/init.d/courier-imap-ssl restart

You might be interested in exploring more about secure email communication. Speaking of email security, you might find it helpful to read about Transport Layer Security (TLS), which is crucial for protecting your emails from eavesdropping. Additionally, understanding Public Key Infrastructure (PKI) can provide insights into how encryption keys are managed and distributed. Lastly, if you’re curious about the various cryptographic protocols used, check out Cryptographic Protocols to deepen your knowledge on the topic.