It's every Marketer's nightmare and a question that is on the lips of most email marketers….”How do I get more people to open my emails?” 
The answer my friend is simple, create subject lines that WOW folks!
Sorry, it really is as simple as that!
OK, you're probably saying “That's OK for you Ian, but where the heck do I start?”
Fear not my fellow email online marketer, those fabulous guys at Hubspot are able to give you a nudge in the right direction.

Here's a few of their ‘WOW Factor' Subject Lines:
1) “Question about [goal]”
What's your question? They'll have to open your email to find out.
2) “[Mutual connection] recommended I get in touch”
Few things are more powerful than referrals. If you share an acquaintance with your prospect, be sure to put that person's name in your email subject line. The more your prospect trusts your referrer, the more compelling your email will be.
3) “Our next steps”
Use this subject line to follow up after a first connection, or to re-engage a prospect gone quiet.
4) “Do not open this email”
This one is from manicure service company Manicube. If you've ever spent time with a toddler, you know that telling someone not to do something tends to prompt that very behavior. Reverse psychology for the win!
5) “X options to get started”
Pop in a few bullet points about how to kick off your relationship in the body text (a content offer, a phone call, an upgrade opportunity for current customers, etc.), and you're good to go.
6) “Hi [name], [question]?”
Questions provoke answers. Emails with question subject lines provoke opens and replies.
7) “Should I stay or should I go?”
If you haven't heard from a prospect in a while, pull out this subject line and pair it with a cleverly crafted breakup email.
8) “Know this about [topic of interest]?”
Offering a helpful tip or statistic about a subject the prospect is interested in establishes your credibility and gets the conversation flowing.
9) “Did you get what you were looking for?”
Use this one to follow up with an inbound lead or a website visitor. They're clearly looking for help with a challenge — ask how you can be of service.
10) [the e.e. cummings subject line]
Most people incorporate capitalization when they draft emails (although some go a little CrAzY). With this in mind, an all-lowercase subject line will stand out.

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