Category: My Blog

Whitelist sender in Zimbra

If you are getting bounced emails with content like below, you will need to either contact the receipient to fix this or to whitelist his domain/email:> The mail system> <youremai@yourdomain.com>: host somehost[some IP] said: 554 5.7.1>  Service unavailable; Client host [some IP] blocked using>  dnsbl.sorbs.net; Currently Sending Spam See:> http://www.sorbs.net/lookup.shtml?some IP (in reply to RCPT TO>  command) With […]

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Mastercard attack by anonymous

MasterCard.com has been taken down after a second distributed denial of service attack by Anonymous. The first attack occurred 3 days ago, after which Visa and PayPal were also successfully attacked. MasterCard’s payment processing systems were affected during the first DDoS attack on Wednesday, with many consumers reporting that they were unable to pay for […]

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