Some Mighty River Power shareholders have yet to receive notification of how many shares they bought during the company's sharemarket float because of a glitch that sent the email into people's junk folders.
Sue Adams, who looks after Mighty River Power's account at share registry firm Computershare, said the company had discovered the problem after it sent emails out in August advising shareholders of the company's annual financial result.
It then received phone calls from people who had received the result email but not advice on how many shares they owned.
Adams said the company noticed the majority of the problems stemmed from people with either a yahoo or xtra email account but it did not affect all emails to yahoo or xtra accounts.
She said Computershare's parent company in Australia had contacted Yahoo to complain about the problem. However, a spokeswoman for Yahoo in New Zealand said that before being contacted by the Herald Computershare had not filed an official complaint with it. Yahoo had since got in touch and was working through the problem with the company.
