I have just bought a new iMac ,Yippee! The migration of my details from my old Mac seemed to work well taking a few hours to complete. Some third party applications do not work on the new operating system as I expected. However although Mail seems to have gathered most of my information, my iCloud and Googlemail accounts receive mail, but the accounts I have with my own ISP (Plusnet) don't. All the relevant account details seem to be the same. Any suggestions?
iCloud and Gmail will be IMAP accounts - Plus Net are probably POP. Your old machine will probably have deleted mail from the POP server so there may be nothing to download. (I've just sent a test email to your Plus Net address - see if it arrives.)
Thanks Mick your test email arrived. In fact all the accounts are IMAP. I solved the problem by deleting and reinstalling them. I had just finished the process when your email came in. Thanks for your help.
Lionel Ogden 