Anti-phishing cybersecurity startup Valimail Inc. today said it has raised $45 million in new funding to accelerate the expansion of its product offering, partnerships and international operations.

The Series C round was led by Insight Partners and included Tenaya Capital, Shasta Ventures, Bloomberg Beta and Flybridge Capital Partners.

Founded in 2015, Valimail offers a purpose-built platform for validating sender identity, both for inbound and outbound email. The service, called “Trust Layer,” is aimed at ensuring that enterprises can trust the email coming into their inboxes and that their customers and partners can trust the email sent to them. The platform is complementary to existing email security solutions, adding an additional layer of security.

“By delivering the world’s first fully automated, identity-based solution for protecting email, we are transforming the way the global enterprise thinks about email security,” Valimail co-founder and Chief Executive Officer Alexander García-Tobar said in a statement. “In short, we are delivering trust – we make enterprise email trustworthy, both for inbound and outbound messages.”

Valimail claims to have a 100% customer retention rate and counts among its partners Microsoft Corp., which uses the company’s platform for visibility into Office 365 email customers.

The company’s round caps off a busy week for venture capital investments into cybersecurity and anti-phishing startups. Other companies raising funding in the market in the last week include IronScales Ltd. and Vade Secure SASU.

“The biggest difference between Valimail and a company like Ironscales or Vade, is that Valimail targets questionable emails by looking at the sender versus the content,” García-Tobar told Crunchbase News. “The focus on sender identity was inspired by how attackers are getting more eloquent in their emails.”

Including the new round, Valimail has raised $39 million to date.

Image: Valimail