MarketingSherpa released an article, "Know-How: How to Make Your Email Enticing in AutoPreview & Mobile -- 16 Samples of Best & Worst Tactics" (Open access until Aug 6).
Tip 1: Start with compelling copy.I totally agree. I see alot of emails when rendered in the AutoPreview screen show me their "Web page version" HTML link.
Tip 2: Use CAPS to catch the eye.
While most spam filters will count this as Shouting, this tactic may increase your SPAM filter score. Use a content checker to see if there is any impact.
Tip 3:Use text symbols to catch the eye.
MarketingSherpa uses the following example:
Mobile Telecoms Daily Service
If I saw that in my AutoPreview screen I would think it was spam!
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