Old problems. Saved answers.

Technical notes from earlier chapters. Kept at their original addresses so old links still have somewhere useful to land.

This is historical material, not current setup advice.

• Pavo’s Postfix Page →

  Mail delivery, autoresponders, and investigating slow POP3.

• VDA Autoresponders →

  Routing virtual mail to an autoresponder with Postfix.

• Why is Courier’s POP3 server slow? →

  An investigation into mailbox scanning and I/O.

• Ruby on Rails Tips →

  Notes from the early days of Rails.

• XmlSimple: already initialized constant →

  Conflicting copies of a library in early Rails and the flickr gem.

• undefined method `size’ for Float →

  A rendering error caused by passing a Float instead of a String.

• Solr: error in opening zip file →

  An old deployment problem involving macOS AppleDouble files.

• Modding a ThinkGeek Giant LED Lamp →

  A small electronics project from the archive.