The situation is no different in SaaS.

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When your emails arrive in people’s inboxes, the first thing you’ll look for is the subject line. To make sure subscribers open your emails, make sure your subject line looks like this:

Obvious, not clever: It’s tempting to dazzle people with clever wordplay. Don’t do this because they’ll get confused and won’t click on your headline. Instead, people understand a clear headline right away and are more likely to click on it.
Specific, not general: People ignore general things because they think they’re irrelevant. But a specific headline tells them exactly what to expect. They’ll click to get it because they know what to look forward to.
Focus on benefits, not features: SaaS brands love to mexico whatsapp number database showcase product features in their marketing materials. But your headline isn’t the place for it. It’s better to examine how those features will benefit people. People respond better to sizzling benefits than dry features.
Here's an example of a simple yet effective subject line from Monday.com.

Source: SaaS Email Templates
Source: SaaS Email Templates
The message is simple: Continue with your free trial registration.

After the subject line, work on the body. Here are some best practices for writing solid email copy: