High-quality paper, bright colors, and rhyming or simple language will help, according to Daniel Kahneman in his Thinking, fast and slow, it is all about create cognitive ease.
Also, due to the mere exposure effect, " a reliable way to make people believe in falsehoods is frequent repetition, because familiarity is not easily distinguished from truth. Authoritarian institutions and marketers have always known this fact." Similarly,, "stocks with pronounceable trading symbols outperform those with tongue-twisting tickers like PXG or RDO--and they appear to retain a small advantage over some time."
P.S. Obviously the quality of the message is important, as one comment pointed out.