Cisco Ironport - Long delivery time for messages manually released
Model - Cisco Ironport C370
OS - 9.7.2-047
Dear Experts
Please can someone assist me.
On my Cisco Ironport I quarantine all emails containing zip files due to company policy.
Recently when I manually release an email it takes forever to come through. Almost 90 mins. This never used to happen before.
Any ideas?
OS - 9.7.2-047
Dear Experts
Please can someone assist me.
On my Cisco Ironport I quarantine all emails containing zip files due to company policy.
Recently when I manually release an email it takes forever to come through. Almost 90 mins. This never used to happen before.
Any ideas?
John Sam George
Check the Receive connector if you are using Exchange first. Then check the IIS in your CAS servers.
Could be greylisting in use somewhere. This is an antispam technique.
Basically, when email is sent from a new user, the SMPT server responds with a "temporary error", and makes the sender retry. After a delay, (which could be 90 mins), it accepts the email, and in future, applies no delay. This is effective, since spammers nearly always give up on the first attempt, while legitimate email nearly always makes multiple attempts.
More here:
https://en.wikipedia.org/wiki/Greylisting
Basically, when email is sent from a new user, the SMPT server responds with a "temporary error", and makes the sender retry. After a delay, (which could be 90 mins), it accepts the email, and in future, applies no delay. This is effective, since spammers nearly always give up on the first attempt, while legitimate email nearly always makes multiple attempts.
More here:
https://en.wikipedia.org/wiki/Greylisting
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I had to log a call with Cisco. Only they could resolve this issue.