## MailOptions.sender property [​](/content/docs/sdk/core.mailoptions.sender#mailoptionssender-property "Direct link to MailOptions.sender property"/index.html)

An e-mail address that will appear on the Sender: field

**Signature:**

```typescript
readonly sender?: string | MailAddress;
```

- [MailOptions.sender property](/content/docs/sdk/core.mailoptions.sender#mailoptionssender-property/index.html)