Thanks Tim.
This is the detail from running Terminal:
* Trying 62.254.26.223...
* TCP_NODELAY set
* Connected to imap.virginmedia.com (62.254.26.223) port 993 (#0)
* successfully set certificate verify locations:
* CAfile: /etc/ssl/cert.pem
CApath: none
* TLSv1.2 (OUT), TLS handshake, Client hello (1):
* TLSv1.2 (IN), TLS handshake, Server hello (2):
* TLSv1.2 (IN), TLS handshake, Certificate (11):
* TLSv1.2 (IN), TLS handshake, Server key exchange (12):
* TLSv1.2 (IN), TLS handshake, Server finished (14):
* TLSv1.2 (OUT), TLS handshake, Client key exchange (16):
* TLSv1.2 (OUT), TLS change cipher, Change cipher spec (1):
* TLSv1.2 (OUT), TLS handshake, Finished (20):
* TLSv1.2 (IN), TLS change cipher, Change cipher spec (1):
* TLSv1.2 (IN), TLS handshake, Finished (20):
* SSL connection using TLSv1.2 / ECDHE-RSA-AES256-GCM-SHA384
* Server certificate:
* subject: CN=email.virginmedia.com
* start date: Oct 1 09:00:18 2020 GMT
* expire date: Nov 2 09:00:18 2021 GMT
* subjectAltName: host "imap.virginmedia.com" matched cert's "imap.virginmedia.com"
* issuer: C=BE; O=GlobalSign nv-sa; CN=GlobalSign GCC R3 DV TLS CA 2020
* SSL certificate verify ok.
< * OK Virgin Media IMAP4 server ready [ e4c558782VM ].
> A001 CAPABILITY
< * CAPABILITY IMAP4rev1 NAMESPACE
< A001 OK CAPABILITY completed.
> A002 LOGIN **** ****
< A002 OK [CAPABILITY IMAP4rev1 LITERAL+ SASL-IR LOGIN-REFERRALS ID ENABLE IDLE SORT SORT=DISPLAY THREAD=REFERENCES THREAD=REFS THREAD=ORDEREDSUBJECT MULTIAPPEND URL-PARTIAL CATENATE UNSELECT CHILDREN NAMESPACE UIDPLUS LIST-EXTENDED I18NLEVEL=1 CONDSTORE QRESYNC ESEARCH ESORT SEARCHRES WITHIN CONTEXT=SEARCH LIST-STATUS BINARY MOVE SNIPPET=FUZZY NOTIFY SPECIAL-USE QUOTA] Logged in
> A003 LIST "" *
* response reading failed
> A004 LOGOUT
* response reading failed
* Closing connection 0
* TLSv1.2 (OUT), TLS alert, close notify (256):
curl: (56) response reading failed