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ldap lookup failures.

ldap user setup

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#1 Mike Howarth

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Posted 11 January 2015 - 12:17 PM

I am continually experiencing 'invalid user' rejections, yet they exist in both Exchange and Cuda portal. Support says its the ldap not responding quickly enough. This may be being caused by the 1000's of spam mails being received daily to non existant accounts.


So a) if the user doesn;t exist does cuda still try to validate via ldap ?- thus overloading the lookup.


and B) how can I prevent this happening as support just say its 'not their problem' - yet the cuda service accepts a mail and 30 secs later rejects and bounces back a second mail to the same user....  


This has got the point where we are seriously considering binning the cuda service.


thanks in advance for any responses.



#2 Mike Howarth

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Posted 13 January 2015 - 05:56 AM

easy when u know - settings, domain, block unknown users.... ! doh.

#3 Michelle Exner

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Posted 26 January 2015 - 03:53 PM

Mike Howarth: are you talking about the Barracuda Email Security Service (BESS) because if you are then it does not use LDAP in any way to validate user for mail delivery.

BESS uses either SMTP verification (what we get back from the rcpt to) or the local userlist to validate users. LDAP is only used to generate the userlist and for user verification when logging into the service.

If however you are talking about the Barracuda Spam Firewall device then yes it can use LDAP to validate users. The LDAP timeout is only 5 seconds and if your LDAP server is not responsive then it case result in timeouts and invalid recipient responses (depending on your setup)

It is possible to set up the Barracuda Spam Firewall device to fail over to SMTP verification but you would need to have SMTP verification enabled on your mail server.

Please contact support for more information on this.

Thank you,

Michelle Exner
Product Lead Support Engineer
Barracuda Email Security
(408) 342-5300