Vypnuti chunkingu na Exchangi 2003

U serveru s Exchange 2003 se v kombinaci s novym linuxovych firewallem (presneji Courierem, antispamem, cca od podzimu 2008) objevily nize uvedene problemy s maily:

- mail prijde na firewall, antispam ho zpracuje a preda Exchangi, nicmene na Exchangi email neni, neni o nem zaznam v Message Tracking Center, proste nedorazi, ani se nevrati odesilateli. Toto se stava zejmena u mailu s prilohou. Resenim je vypnout na Windows serveru/Exchangi tzv. chunking, pokud je zapnuty.

Vzhledem k potencialnim skodam vemte do uvahy, ze nize uvedeny postup je urcen jen pro ty, kteri opravdu vedi co v tomto pripade delaji!

Nejdrive overte, ze je na Exchangi opravdu zapnuta podpora chunkingu, napr.

telnet IP_exchange 25

dale dejte Ehlo servis v(e) uvt.cz a objevi se seznam podporovanych metod smtp komunikace. Pokud tam chunking neni uveden, hledejte problem jinde.

Pokud je na Exchangi chunking zapnuty, budete potrebovat na prislusnem serveru ADSI Edit (je soucasti Windows Support Tools, pripadne se da stahnout i samostatne, viz Google. Samoastatný návod na adsiedit na Microsoftu.

Adsi Edit potrebujete kvuli editaci urcitych hodnot primo v Active Directory. Nastavuje se to pres masku, konkretne nam jde o atribut msExchSmtpInboundCommandSupportOptions, jehoz hodnotu v tomto pripade chceme nastavit na hodnotu 4199616 tj. s vypnutym chunkingem a binarymime. Original navodu http://support.microsoft.com/kb/257569/, nize je vycuc:

To modify this value by using ADSIEdit, complete the following steps:

1. Open ADSIEdit and connect to a domain controller.

2. Open the Configuration Container.

3. Navigate to the following location:

Configuration/Services/Microsoft Exchange/ <Your Organization>/ Administrative Groups/<Your Administrative Group>/Servers/ <Your Exchange Server>/Protocols/SMTP/ <Your Virtual Server Number>

4. Right-click the virtual server object, and then click Properties.

5. For Select a property to view: select msExchSmtpInboundCommandSupportOptions.

6. In the Edit Attribute: field, enter the value you want to set.

NOTE: This value is based on the summation of values from the table above.

7. Click Set, Apply, and then OK.

8. Exit out of ADSIEdit.

Zmena se neprojevi ihned, nepomuze ani restart IIS pripadne celeho serveru, ale rekneme ze do hodiny by se projevit mela. Lze opet overit telnetem, ze chunking jiz neni podporovan