Cron email, and sending email to only one address

So you want to know when your monitoring system fails, or your cron jobs don’t run? Add this to your crontab:

Now install a mail-sending agent. I like ‘nullmailer‘, which is much smaller than most mail-sending agents. It can’t receive or forward mail, only send it, which is what I like about it. No chance of a spammer using my server for something nasty.

The way I have it set up, I’ll have a server (avalanche) sending all email from one address (nullmailer@avalanche.za3k.com) to one email (admin@za3k.com), and that’s it. Here’s my setup on debian:

Now just run echo "Subject: sendmail test" | /usr/lib/sendmail -v admin@za3k.com to test and you’re done!

Installing email with Postfix and Dovecot (with Postgres)

I’m posting my email setup here. The end result will:

  • Use Postfix for SMTP
  • Use Dovecot for IMAP and authentication
  • Store usernames, email forwards, and passwords in a Postgres SQL database
  • Only be accessible over encrypted channels
  • Pass all common spam checks
  • Support SMTP sending and IMAP email checking. I did not include POP3 because I don’t use it, but it should be easy to add
  • NOT add spam filtering or web mail (this article is long enough as it is, maybe in a follow-up)

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moreorcs.com

orc

My newest site: http://moreorcs.com/

The site generates orc-themed emails for you, which you can get emailed at (completely insecurely, it’s just a web address at mailinator to see the content). Please check out mailinator’s site, it’s a really neat project.

Some samples:

  • the last small poop orc (thelastsmallpooporc@moreorcs.com)
  • poop gross green blood thirsty orc
  • 49 cross-eyed slightly intimidating poop dumb orcs
  • the last slightly intimidating orc
  • quite a lot of slightly intimidating small orcs
  • 73 slightly intimidating small pretty orcs
  • smelly orc
  • a few orcs
  • lots and lots and lots and lots and lots and lots of orcs

Archiving gmail

I set up an automatic archiver for gmail, using the special-purpose tool gm-vault. It was fairly straightforward, no tutorial here. The daily sync:

I’m specifying a backup folder here (-d) so I can easily support multiple accounts, one per line.

Cronic is a tool designed to make cron’s default email behavior better, so I get emailed only on actual backup failures.