Our systems are detecting a large increase in the number of ‘phishing’ emails [What is “phishing” and should I be worried about it?] targetting the Halifax Bank.
Currently the large proportion of these are being detected and deleted by our system. However it is possible that the occasional one will slip through.
Halifax Online have provided some information on the emails and dealing with them. Also we suggest reading How to spot a Phishing scam
Most importantly NEVER reveal your online banking details via email.

