Hi, we have an IMAP4 problem which Ipswicth support
currently seem not to bother about (it has been reported but
I guess they are busy with version 6.x...) .

The problem is that the Imap4 service (when only slightly
stressed) occasionally responds (extract from the Imail
log):
"12:06 22:42 IMAP4(00000163) sending "A1 NO AUTHENTICATE:
unsupported authentication mechanism, credentials rejected"

This would probably mean that a user is prompted with
"incorrect userid/password" depending on the client.

The test setup I am using is repeatedly login in with three
different userid's  from the same pc.
This is a log from the client side when the login is ok
* OK IMAP4 Server (IMail 5.08)
A0 CAPABILITY
* CAPABILITY IMAP4 IMAP4rev1 AUTH=CRAM-MD5 AUTH=PLAIN
AUTH=LOGIN
A0 OK CAPABILITY completed
A1 AUTHENTICATE LOGIN
+ VXNlcm5hbWU6
YmVybmR0
+ UGFzc3dvcmQ6
aGVwcA==
A1 OK AUTHENTICATION successful
A2 LOGOUT
A2 OK LOGOUT completed

Note that this happens approximately every10-15 login
attempt so it is quite frequent (with only one user it never
fails) !

I have tried with and without external database, with all
versions from 5.06 to 6.0 and on different computers - all
with the same result.

The result can only mean two things (I think)
1) Imail's imap4 service has a serious bug as the above test
shows that it  fails already under very low preassure.
2) There is a problem with my test set-up; the imail4
configuration or the imap4 protocol handling.

Can anybody help me ? Is Imail imap4 really used out there ?
Do users complain about occasional  imap4 login failures ?
Can anybody spot any issues with test set-up ?

Thanks
Berndt
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