Some of our emails are getting blocked by Spamhaus.
Here's what the bounced emails look like:
The following message to <firstname.lastname@example.org> was undeliverable.
The reason for the problem:
5.1.0 - Unknown address error 550-'5.7.1 Service unavailable; Client host [126.96.36.199] blocked using Spamhaus; To request removal from this list see http://www.spamhaus.org/lookup.lasso'
Reporting-MTA: dns; mta24-d1.ip2.cbr1.mail-filtering.com.au
Status: 5.0.0 (permanent failure)
Remote-MTA: dns; [188.8.131.52]
Diagnostic-Code: smtp; 5.1.0 - Unknown address error 550-'5.7.1 Service unavailable; Client host [184.108.40.206] blocked using Spamhaus; To request removal from this list see http://www.spamhaus.org/lookup.lasso' (delivery attempts: 0)
I have opened http://www.spamhaus.org/lookup.lasso
Entering my Client Host IP (220.127.116.11) into IP Address Lookup Tool returns:
18.104.22.168 is not listed in the SBL
22.214.171.124 is not listed in the PBL
126.96.36.199 is not listed in the XBL
Entering my domain, mincad.com.au, in to the Domain Lookup Tool returns:
mincad.com.au is not listed in the DBL
So we are not listed on any of the Spamhaus lists - but our emails to 3 customers are being blocked?