The trick? Poking around a bit in the iOS editing pop-up—you know, the one that appears when you tap and hold to select text.
Open the iOS Mail app, tap the Compose button, then tap out some text in the body of the message. Next, tap and hold a word, tap Select, then drag the tiny little blue handles to highlight the words you want to edit.
You should now see a small black pop-up in the Mail app with a series of editing buttons on the top, such as Cut, Copy, and Paste. If you’re using an iPad, you’ll also see a button marked BIU; on an iPhone, you’ll need to tap the arrow on the right side of the pop-up until the BIU button appears.
Once you tap the BIU button, three new buttons will pop up: Bold, Italics, and Underline. Tap one, two, or even all three of the buttons you want, and presto!
A little bold, italics and underlining can do wonders for your Mail signature. When in the mail app, just tap Setting, Mail, Signature to start experimenting.
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