Wanderlust login string with “@”

[John Morris <2e0byo@gmail.com>]

Hi,

this is probably a very obvious question, but how do I specify a login
string which contain the “@” character?

I haave to connect to university email with the following imap setup (verified
with Thunderbird):

encryption: SSL
username: username@durham.ac.uk
imap server: outlook.offfice365.com:993

but the first @ is stripped and thus connection fails with: 

%INBOX:lntq@durham.ac.uk/clear@outlook.office365.com:993!	"INBOX"

and if I quote it, I get ‘Authentication is failed’ (Which, incidentally
should say ‘authentication failed’ to be proper English):

%INBOX:"lntq@durham.ac.uk"/clear@outlook.office365.com:993!	"INBOX"
 (this fails)

The question is: how do I specify the login name as a string containing
‘@’ so that it doesn’t fail?

Many thanks in advance,

John