“You may be better off asking for a ‘call’, instead of trying to put some time on their ‘calendar’. Both words tend to be used when scheduling meetings, yet we see that subject lines containing the word ‘call’ work best (62% open rate, 35% reply rate), while emails bearing ‘calendar’ perform worse (33% open rate, 10% reply rate).”
Know what words in your subject lines increase email open rates. Examples include “call”, “meeting”, “welcome”, “renewal” and “upgrade” among others. Research which words work best with your brand and go from there. See if you don’t notice a dramatic difference in your email open rates.