Invalid sequence in Uid - imparse_issequence()

[Vladimir Tyman]

Hi,

we are using 2.1.16 and one user has problem with Mozilla 1.6.0 (OS is Freebsd).
Relevant part from telemetry log:

....
20 OK Completed
<1075899316<21 UID fetch 22738:22750,22752:22759,22761:22762,22765:22774,22779:2
2786,22788:22791,22793:22816,22818:22825,22827:22850,22852:22889,22891:22905,229
07:22918,22920:22921,22923:22932,22934:22962,22964:22966,22968,22970:22995,22997
:23000,23003,23005:23017,23019:23025,23027:23030,23032:23035,23037:23079,23081:2
3094,23096:23113,23115:23116,23118:23126,23128:23132,23137:23142,23144:23148,231
50:23161,23165:23169,23172:23201,23203:23204,23206:23209,23213:23233,23235,23237
:23242,23245:23262,23264:23266,23268:23269,23271:23272,23282:23321,23336:23342,2
3344:23386,23388:23393,23397:23401,23404,23406:23407,23409,23411,23413,23415,234
19:23427,23429:23435,23438,23441:23448,23451:23455,23457:23473,23475:23479,23481
:23487,23491,23493:23495,23498:23508,23510:23513,23516,23518:23526,23528:23529,2
3532:23537,23539,23541:23543,23545:23558,23560:23571,23573:23581,23583:23585,235
87:23589,23591:23594,23596:23599,23602,23604:23611,23613:23625,23628:23630,23632
:23654,23657,23660:23680, (UID RFC822.SIZE FLAGS BODY.PEEK[HEADER.FIELDS (From T
o Cc Subject Date Message-ID Priority X-Priority References Newsgroups In-Reply-
To)])
>1075899316>21 BAD Invalid sequence in Uid
....

When I looked on the part of the code in imapd.c it seems that 
function imparse_issequence returns for above sequence 0.
Is there something weird on this sequence (I don't know by heart all of IMAP's? RFCs).
If so I send it to Mozilla's mail client Bugzilla.

Regards

--
Vladimir Tyman
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