Specifications

IETF groups:

RFCs and server support:

RFC

Name

Capability name

Dovecot

Cyrus

2087

IMAP4 QUOTA extension

QUOTA

v1.0

yes

2088

IMAP4 non-synchronizing literals

LITERAL+

v1.0

v1.5

2177

IMAP4 IDLE command

IDLE

v1.0

v2.0

2193

IMAP4 Mailbox Referrals

MAILBOX-REFERRALS

no

v2.1

2221

IMAP4 Login Referrals

LOGIN-REFERRALS

v1.0

no

2342

IMAP4 Namespace

NAMESPACE

v1.0

v1.6

2971

IMAP4 ID extension

ID

v1.2

v1.6

3348

IMAP4 Child Mailbox Extension

CHILDREN

v1.0

v2.1

3502

IMAP4 MULTIAPPEND Extension

MULTIAPPEND

v1.0

v2.0

3516

IMAP4 Binary Content Extension

BINARY

no

v2.2

3691

IMAP4 UNSELECT command

UNSELECT

v1.0

v1.6

4314

IMAP4 Access Control List (ACL) Extension

ACL

v1.2

yes

4314

IMAP4 Access Control List (ACL) Extension

RIGHTS=*

v1.2

v2.3

4315

IMAP UIDPLUS extension

UIDPLUS

v1.1

v1.6

4467

IMAP - URLAUTH Extension

URLAUTH

no

v2.4

4469

IMAP CATENATE Extension

CATENATE

no

v2.3

4551

IMAP Extension for Conditional STORE Operation or Quick Flag Changes Resynchronization

CONDSTORE

v1.2

v2.3

4731

IMAP4 Extension to SEARCH Command for Controlling What Kind of Information Is Returned

ESEARCH

v1.2

v2.4

4959

IMAP Extension for Simple Authentication and Security Layer (SASL) Initial Client Response

SASL-IR

v1.1

v2.2

4978

The IMAP COMPRESS Extension

COMPRESS=DEFLATE

v2.0

v2.4

5032

WITHIN Search Extension to the IMAP Protocol

WITHIN

v1.2+

v2.4

5162

IMAP4 Extensions for Quick Mailbox Resynchronization

QRESYNC

v1.2

v2.4

5182

IMAP Extension for Referencing the Last SEARCH Result

SEARCHRES

v1.2

no

5256

IMAP SORT and THREAD Extensions

SORT

v1.0

v2.0

5256

IMAP SORT and THREAD Extensions

THREAD=ORDEREDSUBJECT

no

v2.0

5256

IMAP SORT and THREAD Extensions

THREAD=REFERENCES

v1.0

v2.0

5257

IMAP - ANNOTATE Extension

ANNOTATE-EXPERIMENT-1

no

no

5258

IMAP4 - LIST Command Extensions

LIST-EXTENDED

v1.1

v2.4

5259

IMAP - CONVERT Extension

CONVERT

no

no

5267

Contexts for IMAP4

ESORT

v1.2

no

5267

Contexts for IMAP4

CONTEXT=SEARCH

v1.2

no

5267

Contexts for IMAP4

CONTEXT=SORT

no

no

5464

The IMAP METADATA Extension

METADATA

no

no

5465

The IMAP NOTIFY Extension

NOTIFY

no

no

5466

IMAP4 Extension for Named Searches (Filters)

FILTERS

no

no

5524

Extended URLFETCH for Binary and Converted Parts

URLAUTH=BINARY

no

v2.4

5530

IMAP Response Codes

-

v1.2

no