Email-efficiency service Boomerang has done some analysis on what makes the perfect email. The company looked at more than 5.3 million messages to see which got the most responses and found that those emails that were slightly positive or slightly negative had higher response rates than neutral emails. The analysis also revealed that asking a couple of questions is a good thing, but more than three is too many.

Airbnb co-founder Joe Gebbia has shared the email that illustrates the idea for Airbnb. In the email which Gebbia wrote to his roommate, he explained how the two could use air mattresses to rent out sleeping space to designers who were coming to San Francisco for a conference. "Brian - thought of a way to make a few bucks - turning our place into a designers' bed and breakfast," Gebbia wrote.

Eighty-three percent of IT professionals consider email a common avenue for system attacks, yet only 10 percent have email security training in place, according to a new report from Mimecast. The research includes feedback from 600 IT security managers and also revealed that only 35 percent of respondents feel confident in their preparedness against data breach.

Cause of Action Institute, a conservative watchdog group, is pushing Republicans in Congress to investigate whether State Department officials used email accounts associated with Hillary Clinton's presidential campaign for official business. The group claims that some State Department officials used their email accounts from Clinton's 2008 campaign years after the election ended. The addresses in question end in hillaryclinton.com, and differ from the State Department.

Email will likely be a deciding factor in electing the next U.S. president. Last time around, Barack Obama had collected 40 million names on his email list, compared to Romney's 4 million names. According to eDataSource, this time around Ted Cruz has 3.6 million people on his list so far with a read rate of 15 percent. While Donald Trump's list is smaller, his open rate averages 26 percent.

Security experts are pretty certain that they can spot a data breach, according to a new study by security firm Tripwire. The organization surveyed 763 IT professionals and found that 71 percent said it would only take a few minutes, or possibly a couple of hours at worst, to identify a configuration change to their company's network.

The Indian Army is warning its staffers to beware of an email scam. The email claims to come from the Indian Army webmaster and asks recipients to login to a malicious page. The agency has warned personnel not to reveal their personal details to any email.

Nigerian spammers are moving beyond their kingdoms into outer space. The latest spam email making the rounds claims that an astronaut needs to raise money to get back to Earth. The alleged Dr. Bakare Tunde, a "project manager of astronautics" at Nigeria's National Space Research and Development Agency is trying to dupe recipients into donating money to its fake cause.

Ted Cruz has addressed Hillary Clinton's email server controversy in his latest campaign ad. The commercial is inspired by the hit film "Office Space" and depicts a Clinton-like character and her aides throwing a server into a field and beating on it with a baseball bat.

Donald Trump has accused the Republican National Committee of allegedly using his name in fundraising emails illegally. The Republican candidate complained about the email via a press release and on Twitter on Saturday just before the South Carolina Republican debate. "The RNC, which is probably not on my side, just illegally put out a fundraising notice saying 'Trump wants you to contribute to the RNC,'" his campaign said. "The RNC does not treat me well and then they use my name, without my knowledge, to raise money for themselves."