Retrieve Server announced CAPABILITY

When connecting to an IMAP server (sometime before or after login) the server usually returns a CAPABILITY

e.g.

* CAPABILITY IMAP4rev1 UNSELECT IDLE NAMESPACE QUOTA ID XLIST CHILDREN X-GM-EXT-1 UIDPLUS COMPRESS=DEFLATE ENABLE MOVE CONDSTORE ESEARCH UTF8=ACCEPT LIST-EXTENDED LIST-STATUS LITERAL- APPENDLIMIT=35651584

for gmail right now or

* OK [CAPABILITY IMAP4 IMAP4rev1 UIDPLUS CHILDREN NAMESPACE THREAD=ORDEREDSUBJECT THREAD=REFERENCES SORT QUOTA IDLE ACL ACL2=UNION] perdition ready on sslproxy03.your-server.de 0002eb6b

for a Hetzner server of ours.

Is there any way this information could be exposed ? Or is it already and I did not see it ?

We would like to check for CONDSTORE capability to warn users if this feature is missing.

[andris9]

ENABLE and CONSTORE are different extensions. ENABLE makes any change permanent, having (CONDSTORE) argument for SELECT enables CONDSTORE for that mailbox session only. In retrospect there’s not much difference, these extensions usually go in pair so emailjs could have used just as well the ENABLE command.

[matthiasg]

I had read rfc5161 to supersede rfc4551 as in you first have to enable it to then use it. but since gmail works I must have misunderstood. Thanks!