Recently there has been an increase in the amount of SPAM being sent out into the wild. Due to this some ISP's have found themselves included on RBLs (realtime blacklists).

Because our mail filters make use of a number of RBLs this can lead to emails being blocked from some senders who use those ISP's.

The sender may receive a message such as:
cloudmail.bignoise.co.nz #<cloudmail.bignoise.co.nz #5.7.1 smtp; 554 5.7.1 Service unavailable; Client host [123.214.111.222] blocked using dnsbl.sorbs.net; Currently Sending Spam See: http://www.sorbs.net/lookup.shtml?123.214.111.222> #SMTP#

or

The message for failure includes the following
fast 550 (111.222.123.131) junk mail reject)

If so then they should contact their email provider to resolve

To find out if a server has been blacklist check http://www.webconnect.nz/knowledgebase/166/Check-to-see-if-mail-not-black-listed.html

Tuesday, March 15, 2016





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