Why can I send emails but not receive them?

Q Since changing my broadband connection to Talk Talk, I am unable to send emails, but am still able to receive them.
David Hurst

A ISPs restrict access to their outgoing email server (also known as SMTP servers) to people connected to its internet service – its own customers. You don’t say who your previous ISP was, but you still have its SMTP server details set up in your email program, which explains why you can’t send email. Incoming, or Pop/Imap, email servers can generally be used over any internet connection, since incoming email is impossible for a spammer to abuse and an ISP’s customers are likely to want to receive email on all manner of computers. That’s why you are able still to receive email sent to your old email address.

The solution is simple, but the exact steps to achieve it depend on which email program you use - and you didn’t tell us. Essentially, you need to edit the email account settings in your email program and change its ‘outgoing mail’ or ‘SMTP server’ to smtp.talktalk.net, but Talk Talk has full instructions on its help site.