The public are urged to be vigilant ahead of the festive season after a "surge" in scam attempts have been reported.
The latest scam doing the rounds sees fraudsters pretending to be from An Post.
Innocent people are being targeted for their money or personal information by criminals carrying out 'phishing' attempts.
These commonly see scammers pretending to be from financial institutions, delivery companies and government departments.
The message purporting to be from An Post asks customers to pay a charge to release their packages from customs.
Gardai are warning people that An Post will never send people links when contacting them about customs charges.
Members of the force in both the Donegal and Laois/Offaly divisions issued the alert on Tuesday.
They said: "Shop safe and be scam aware. There has been a recent surge in scam messages requesting customers to pay a charge via a link.
"An Post will never send a message containing any links when contacting you about the payment of customs charges.
"If you are ever in doubt about scam messages we have further information on anpost.com/security to help you identify legitimate and scam messages."
It comes after gardai issued a similar warning on Monday about both Bank of Ireland and An Post scams.
Gardai for the Waterford, Kilkenny and Carlow regions said: "They just keep coming and coming. Some phones are recognising many of the scam 'phishing texts' that are doing the rounds.
"This is a useful feature, and was noticed on a Huawei Android device and puts these in a 'spam folder'.
"In the meantime, stay vigilant and beware the dreaded links.
"Beware also that these scam texts can insert themselves amongst legitimate texts from a legitimate source, Bank of Ireland reported this recently with their BoI texts.
"Note also that where customs are looking for payment through An Post, there is no link and you are told to go to your local post office or online but NO link is provided. Stay safe."
