Yahoo has been hit with embarrassing security reports in recent weeks, which include hackers stealing the personal information of at least 500 million users and mail spying by US intelligence agencies.
Many people indicated that they are leaving the mail provider, but Yahoo has made it more difficult by disabling email forwarding.
The Associated Press reported that automatic email forwarding was disabled at the beginning of October.
“While those who’ve set up forwarding in the past are unaffected, some who want to leave over recent hacking and surveillance revelations are struggling to switch to rival services,” said the Associated Press.
Yahoo said the email forwarding feature “is under development”.
“While we work to improve it, we’ve temporarily disabled the ability to turn on Mail Forwarding for new forwarding addresses,” said Yahoo.