I have used Dovecot as my IMAP server since 2007. It has always been reliable and useful. Recently, I wanted to move my IMAP server to one host to another. I am the only user on this IMAP server. Wait, not I’m not, there are some test accounts on here, mostly used to verify that …
Setting up a new Dovecot server on FreeBSD with an OSX mail.app client Read More »
Back in late November (now 56 days ago), I started getting huge levels of very directed spam. When I tweeted about it, I was getting perhaps 100-250 a day. I thought it would soon stop and they would target someone else. They would get into my spam folder yes, but it still takes time to …
Using Postfix to block mail based on From/sender and To/recipient Read More »
Today I gave up on my attempt to allow relay via SSL certificate fingerprints. Instead, I will use sasl auth. Yesterday I wrote about my SMTP deliver test which broke when an SSL certificate was updated. Later that day, I finished writing scripts which delivered that fingerprint file to all hosts which needed it. Today, …
No more certificate fingerprints – only sasl auth instead Read More »
Let’s Encrypt is an easy way to get free SSL certificates in an automated manner. You may never have to manually do another cert renewal again. Last night, I received this email: From: Cron Daemon To: dan@langille.org Subject: Cron /usr/local/bin/cert-puller Date: Fri, 23 Feb 2018 23:57:00 +0000 (UTC) /etc/rc.conf: 3: not found /etc/rc.conf: yr: not …
Postfix suddenly starts rejecting email it had been accepting Read More »
Yesterday, I upgraded a DigitalOcean droplet from FreeBSD 10.3 to FreeBSD 11.1 just before I headed to work. I’ve done such upgrades several times before. They all went well. This one did not. Several issues cascaded to prevent me from completely this task in a timely manner. Let me describe the events as they unfolded. …
/etc/rc.subr: 1391: Syntax error: “fi”: unexpected Read More »
If you’re using Postfix for submission and attempts to submit give this messages on the Postix server: Recipient address rejected: Domain not found you’re probably chroot’d. That is, your submssion entry in master.cf looks like this: submission inet n – – – – smtpd When it should look like this: submission inet n – n …
reject_unknown_recipient_domain gives Recipient address rejected: Domain not found Read More »
Postfix has been trying to tell me something: your configuration is wrong. Most cleverly, Postfix has been emailing me about this. The first email came on 22 Oct 2014. I ignored it. The second email arrived five days later on 27 October 2014: I recall looking around, but I didn’t do anything. I think I …
Postfix SMTP server: errors – TLS not available due to local problem Read More »
I decided to set up some of my mail servers to require certification authentication on the submission port (587). In my case, I want to forward mail from my server at home to my public servers out there on the Internet. I don’t want just anyone to be able to submit mail here, so the …
I have a number of things I want to get done in the short term: remove the mail server on my gateway box at home and start using a mail server on an internal box Configure my external mail servers (out there on the Internet) to use TLS when talking to each other Configure those …
NOTE added 2013-11-10: I think I found the cause. Read about it in this FreeBSD Forums post. I’ve seen seeing the following in the mail log for my imap server. The mail messages in question are the daily run and security run emails that go out from FreeBSD machines. They aren’t big. As shown above, …
postfix/postdrop: warning: uid=0: File too large Read More »