HTML Email: JWZ's fault?

One-time Netscape Navigator developer Jamie Zawinski suggests that HTML support in email might have been his fault.

Whoops: iOS 11 Mail Microsoft Issues

If you've upgraded your iPhones to the just-released iOS version 11 and your email is hosted by Microsoft's Outlook.com, Office 365 or Exchange 2016, you may now find yourself unable to send email from your iPhone. It sounds like a known issue and that it is being worked on.

In the mean time, the most commonly suggested workaround seems to be that you should download Microsoft's Outlook email client for iOS and use that instead.

Full Email Headers

Email message headers have a lot of information in them. Only the tiniest amount of that header information is typically exposed to a recipient by default. There's much more to it than just the from address, to address, subject line and date. There's routing information, authentication information, IP address information, and more information hiding just beneath the surface, in the "full headers" or "internet headers" of that email message. To get at the rest of that header information associated with a given email message, a recipient will need to "view full headers" or "view the message source."

Here's a guide from MXToolbox on how to get full email header information from various email clients.

Google explains how to obtain full headers from Gmail, and even shows you how to extract valuable information from them.

Microsoft explains how to obtain full headers from various versions of the Outlook email client.

Pro tip: When somebody asks you to send them email headers, don't send them a screen shot of the from address or email body. That's not what they're asking for. (And screen shot images aren't searchable; if somebody is trying to help you troubleshoot something, it is painful to have to manually read each line of a header in an image to try to find the right header.) Instead, send them a text file attachment containing all of the copied-and-pasted email header info, or full message source.

Hotmail UK MX Change

The MX servers for Hotmail UK changed in DNS overnight. For those who are caching DNS or have hard coded DNS entries, you're going to run into problems with false positive "user unknown" bounces. Time to flush the cache and make sure you're relying on what's currently in DNS.

I'd include the specific domains here, and their new MX records, but I don't want to lead people down the wrong path of hard coding MX record entries, when they really should be relying on DNS.