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Subject: Try [service/feature name] with a free trial today

Hi [Customer First Name],

We’re very pleased to announce the launch of [service name/feature name]. I remember you requested it last year, so I thought I’d write to see if you’d be interested in a free trial. You can get started using [this link].

I look forward to your feedback on [service name/feature name]. Let me know if you need any help!

Best,

[Your First Name]