Contact from HMRC

I wanted some confirmation about contact methods HMRC will use when trying to contact me. I believe I chose the email option when selecting preferred contact method, but was told there could still be letters sent out as a form of contact. I am aware that the VAT number letter is one such information which is sent out by post only. I wanted to know if you can give me information on what other contact from the HMRC will also be post only and what type will be email.

Hi. Due to the many different departments and taxes within HMRC we cannot provide exact details regarding how you will be contacted as these can be specific to each indvidual/business. However please refer to the guidance linked below which explains several different contacts HMRC may make with a business : Check genuine HMRC contact that uses more than one communication method   . Thank you .