P990i email problem

I have a Sony Ericsson p990i and I can’t get it to connect to my Dreamhost account - trying either secure or non-secure email; IMAP or POP3 I get ‘details incorrect’.

I run a mailbox on my domain, so am connecting to mail.blah.co.uk.

I can connect to WiFi and use webmail via Opera Mini, but that’s clunky and a waste of bandwidth when (quicker) push messaging is on the device.

Any ideas? I’ve added the Equifax certificate - no joy, ditto with Sony support who just gave me a form email about security certificates…but surely I should be able to connect without SSL?