In Thunderbird (and I assume in many other clients, too) I have the option to choose between "SSL/TLS" and "STARTTLS". As far as I understand it, "STARTTLS" means in simple words "encrypt if both ...
I´m using a Postfix TLS Policy to enforce TLS for outgoing email. Unfortunately in some cases the certificate verification fails and I don´t know why. For instance, this is an excerpt of my TLS ...
I'd like to know what my local postfix says to the Amazon SES smtpd after the STARTTLS. In plain text, so I can understand it. Amazon SES requires TLS, so I can't temporarily turn it off. I currently ...
Recently, after I installed updates on my Kubuntu 14.04. system and a new version of thunderbird was installed, I could not send emails any more. It prompts: Sending of message failed. The message ...
I set up my mailserver with postfix 2.7.1 and dovecot 1.2.15 and everything seemed to work just fine, but now I found out that people using @gmx.net addresses cannot send emails to me and rather ...
I've setup a Postfix + Courier server and have a Rails app configured with the SMTP server settings. Whenever the Rails app tries to send an email, this is what appears in the Postfix log (additional ...