Handful of improvements and bug fixes

• chore: update dependencies 4305162
• chore: commit fixtures .env file 853c08d
• fix: add sendLater to the MailManager 6f9184d
• docs(README): add audit badge 41b38b2
• test: add test for providers 11942ec
• chore: update license.md file adab93b
• chore: update dependencies 33c6002
• chore: update prettier ignore file ca2d7dc
• chore: update dependencies 45f6993

v4.2.1...v4.2.2