Some banks in Lagos on Tuesday warned customers not to respond to requests for their personal bank details over the Internet, telephone or in person.
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Mr Francis Barde, Head, Corporate Affair Department, Union Bank, said that more people were now getting scam e-mails than before.
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Barde said that "scammers" were taking advantage of changes in electronic banking transactions to dupe unsuspecting customers of their money.
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"More people are embracing the e-payment system which is popularly known as cashless policy.
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"As a bank, steps have been taken to protect customers and secure their transactions.
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"It has become part of our policy to often inform our customers not to share their personal bank details with a third party.
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"Also, customers should be wary of any email or Website that requires them to fill forms that require their personal identification numbers, passwords or security codes, " he said.
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Mr Ramon Nasir, Head, Media Relations Unit, United Bank for Africa (UBA) Plc, Marina, said that many of the e-mail scams looked real for an ignorant and unsuspecting customer.
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According to Nasir, there are many types of scams with the sole aim of stealing customers' account, information number and money.
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"UBA Plc has taken steps to secure and protect its customers against cyber crimes and other forms of e-banking threats.
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"The drive towards a cashless economy has necessitated that we put in place systems and processes that would protect our customers.