'Highly convincing emails' and messages appearing to be from Royal Mail are attempting to defraud victims.
Using 'incredibly sophisticated tactics', digital messages are being sent by scammers phishing for information.
One such text people are being sent reads: "Royal Mail : Your package has been held and will not be delivered due to a £1.99 unpaid shipping fee."
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The message contains a payment link, asking for victims' bank details.
Royal Mail states: "These are some typical examples of scams that look like they’re sent by Royal Mail, but are in fact fraud or phishing scams.
"Please don’t click on any of the links in these emails and be vigilant if you receive a communication which you aren’t sure about."
If you receive a suspicious email, text message, telephone call or discover a Royal Mail branded website which you think is fraudulent, please report it to reportascam@royalmail.com.
Tony Pepper, CEO of cybersecurity firm Egress, said: "As the world continues to rely on digital communication channels wherever possible, we've seen an inevitable surge in phishing activity over the last year, with cybercriminals sending out highly convincing emails posing as trusted organisations.
"Unfortunately, these recent emails claiming to be from the Royal Mail are part of the latest scheme aimed at tricking people into parting with their money – and in many cases are using incredibly sophisticated tactics to do so."
