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HMRC internal manual

Specialist Investigations Operational Guidance

HM Revenue & Customs
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Introduction and organisation: communication: communicating by external email: signing your emails

Your signature at the bottom of your emails must be appropriate. You should add the following to the end of your signature for any external emails:

‘If you have any doubt about the authenticity of an email you receive which claims to come from HM Revenue & Customs (HMRC), please do not follow any links within the email, disclose any personal details or respond to it. Forward it to us at

We recommend having two signatures, one for internal emails and another for external.

Also, be aware that out of office messages do not go to non-GSI email addresses, so customers will not receive them. You may wish to consider granting delegate access to a colleague. Refer to the Electronic Communications Email Guidance for further assistance.