Unable to SEND emails since switch to EE

[#1]

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@SteveMJones wrote:
I'm using relay.force9.net with no issues. There was a problem with DKIM config with Greenby service, but Greenby seems to have resolved this. Hotmail and Outlook were bouncing my emails for a bit, but all seems fine now. Never had a problem yet with Gmail addresses

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You must tell us your secret, then!

[#2]

Nothing I'm doing knowingly. May simply be down to the differences between @plus.net and @force9.net.

[#3]

Hello All

I had the same problem with being unable to send emails since moving to EE. I followed the advice to change my username to my full email address - I wasn't entirely sure exactly what steps were needed, but I hoped I'd done enough - and it seemed to work. I was able to send to any address, even the hotmail addresses which had caused the longstanding problems that have been documented here in such detail. However, since yesterday I have been unable to RECEIVE anything, in Outlook and also in Greenby webmail, which was not affected by the sending problem. Error messages refer to the connection to the server being interrupted, contact your server administrator or ISP, errror 0x800CCC0F (Outlook); and Server error, Internal error occurred, refer to server log (webmail). These messages mean little to me as a non-techie. Has anyone else got the same problem?

My apologies if there is already a thread about this. I did search for one but didn't find one - so I'm sorry if there is one and I didn't get the right keywords.