For the past 18 months, engineers at PayPal, Google, Facebook, Yahoo, AOL, Microsoft and nine other technology companies have spent their off-hours (and some on-hours) working hand in hand to tackle the problem that plagues them all: e-mail phishing. The result is DMARC, or, "Domain-based Message Authentication, Reporting & Conformance". It's not new, but puts SPF and DKIM to work in a new way.
Sunscreen's a pain, but sunburn is worse. UV-protective clothing is expensive and not to everyone's taste. Instead, treat your own cotton, rayon, or silk clothing to make it sun-protective. Some clothing is inherently protective, but you can easily burn right through a new shirt, especially if it gets wet. A couple of boxes of either of two different brands of a wash-in UVA/UVB blocker will invisibly increase the SPF of a whole washer-load of clothing from 5 to 30 (repeat for an SPF of 50). The stuff wears off after a season's worth of launderings, so use a permanent marker to note the year of treatment inside the collars.