Import SSL certificate for use in msmtp

gistfile1.md

With the recent heartbleed SSL vulnerability, FastMail have updated their SSL certificates. Here's how to download the certificate and convert it into PEM form.

Find out which certificate you need:

% msmtp -a fastmail --tls-certcheck=off --tls-trust-file= --serverinfo

Download the certificate:

% curl -O https://www.digicert.com/CACerts/DigiCertHighAssuranceCA-3.crt

Convert it into PEM format:

% openssl X509 \
> -inform DER -in DigiCertHighAssuranceCA-3.crt \
> -outform PEM -out DigiCertHighAssuranceCA-3.pem

@jezen could you help provide more detail how to skip handling cert file and use the tls_fingerprint?
Thanks

@huynhtanloc2612 I run the following command to obtain a new TLS fingerprint:

msmtp -a personal --tls-certcheck=off --tls-trust-file= --serverinfo

…And I have a ~/.msmtprc file like this:

defaults
auth            on
protocol        smtp
tls             on

account         personal
user            [email protected]
from            [email protected]
passwordeval    gpg --use-agent --no-tty --decrypt ~/.mutt/personal_smtp.gpg
host            smtp.fastmail.com
port            465
tls_starttls    off
tls_fingerprint AF:01:8E:…

I have redacted my email address and TLS fingerprint for obvious reasons. You can use the above as an example, but you'll need to change it to suit your own setup.

Thanks @jezen, I tried your suggestions and it shows below message

msmtp: TLS handshake failed: An unexpected TLS packet was received.
msmtp: could not send mail (account default from /data/data/com.termux/files/home/.msmtprc)

Do you have any idea?

@huynhtanloc2612 Sorry, I won't be able to help. You might be able to make progress by running msmtp in debug mode.

Thanks @jezen!
Finally I can use msmtp to send email successfully.
What I did:

• Turn on tls_starttls in .msmtprc file.
  tls_starttls on
• Turn on the second factor verification for my google account and then create an app password. Put the app password into .msmtprc file
  password <the app password>
• Send an email with below command line
  printf "Subject: Test\nHello"|msmtp [email protected]
  And it worked :))

@huynhtanloc2612 Excellent. Thanks for documenting your steps here 👍

I was able to send mails following all the steps provided. Thanks guys for your contribution!