Support OAuthBearer

[Nix]

	options := &imapclient.Options{
		WordDecoder: &mime.WordDecoder{CharsetReader: message.CharsetReader},
		DebugWriter: os.Stdout,
	}
	
	c, err := imapclient.DialTLS(fmt.Sprintf("%s:%d", imapServer, imapPort), options)
	if err != nil {
		log.Fatal(err)
	}
	defer c.Close()
	
	cl := sasl.NewOAuthBearerClient(&sasl.OAuthBearerOptions{
		Username: username,
		Token:    token,
		Host:     imapServer,
		Port:     imapPort,
	})
	err = c.Authenticate(cl)
	if err != nil {
		log.Fatal(err)
	}

Result :

* OK Yandex IMAP4rev1 at mail-imap-production-29.iva.yp-c.yandex.net:993 ready to talk with ::ffff:46.73.73.218:64853, 2023-Aug-14 12:55:20, KtaXGO0WxOs0
T1 CAPABILITY
* CAPABILITY IMAP4rev1 CHILDREN UNSELECT LITERAL+ NAMESPACE XLIST BINARY UIDPLUS ENABLE ID AUTH=PLAIN AUTH=XOAUTH2 IDLE MOVE
T1 OK CAPABILITY Completed.
T2 AUTHENTICATE OAUTHBEARER
T2 BAD AUTHENTICATE Command syntax error. sc=KtaXGO0WxOs0_140955_imap-production-29
2023/08/14 12:55:20 imap: BAD AUTHENTICATE Command syntax error. sc=KtaXGO0WxOs0_140955_imap-production-29

Please help me with OAuthBearer token

[Simon Ser]

This server doesn't support the OAUTHBEARER mechanism (see the AUTH= fields in the CAPABILITY response).

[Nix]

This server doesn't support the OAUTHBEARER mechanism (see the AUTH= fields in the CAPABILITY response).

Yandex confirmed that for mail services, authorization is based only on application passwords.