I have one old blueyonder account with multiple aliases and one external imap account so have been trying out a few options.
When I use Settings/Email and scroll to the bottom of the page I can choose which of my blueyonder aliases is the default From address, but my imap account address doesn't appear on the dropdown list so I can't set that to the default From address.
When I click on the blueyonder account inbox then hit Compose, the default From address matches what I selected above but I can change it to the external imap address using the dropdown From list.
When I click on the external imap account inbox then hit Compose, the external imap email address is used as the From address, but I can use the dropdown From list to change it to any of the blueyonder addresses.
So what I'd ideally like is to be able to set the default From address to the external imap address in Settings/Email and for all email addresses to appear in the From address list in Compose irrespective of which Inbox I had previously clicked on.
Apologies for not responding to the thread again at the back end of last year.
I've checked on the ticket I raised and the email team confirmed it wasn't currently possible to set a non-Virgin Media address as the default 'from' address. I've filed a request to see if this can be amended in future, but it's likely there won't be any firm timescales if the requests is accepted.
I'll keep the thread updated as and when I learn more.
So far I think the quickest solution would be to just Highlight the account (you don't even need to be in the Inbox) you want to send as, prior to clicking Compose. It certainly saves fiddling with the drop down list.
Admittedly it would definitely be better to have it in settings, but once you've gotten the habit it should just flow.
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