Sky has apologised to customers migrating to its new email service, after many people's inboxes were inundated with old and deleted messages.
The problem occurred during Sky's move from its existing Gmail-based platform to a new Yahoo! platform; a major project that resulted in severe disruption for many people whose inboxes became clogged with irrelevant material.
Sky initially attempted to iron out the issue before quickly realising that the problem was far greater than first thought.
"It has has taken much, much longer than we anticipated and for that we are extremely sorry," the broadband provider stated.
In the meantime, Sky has recommended that customers follow some steps to troubleshoot the problems, including signing in via the web at Sky Yahoo! Mail through sky.com and also checking the email connection settings to see whether they are set to IMAP or POP, as the two can behave differently.