Docker 101

This isn’t a “What is Docker?” post; you can find those everywhere, written by people who understand it, and can explain it, much better than I. This is a quick & dirty “get-it-running” primer. A Docker image consists of a “base layer” (usually a slimmed down version of Linux, or Windows) and software additions/modifications layered […]

SMTP 5.7.3 Requested action aborted; user not authenticated. [SOLVED!!]

An e-commerce site that I maintain had been working fine, then all of a sudden emails stopped sending. We started seeing this error: Mailbox unavailable. The server response was: 5.7.3 Requested action aborted; user not authenticated   We hadn’t changed any code, and our username/password worked fine on the web. It turns out that our […]