Hi Symantec,
Subscribers are calling upset they are not receiving the subscription emails they have paid for.
About 8 days ago our client started to get 553 bounceback errors to contacts we've been sending to all along. This daily Newsletter goes only to subscribers that have paid an annual fee and there have not been any changes to template of sign-up method compared to previous months. DKIM and SPF records all check out cleanIP hasn't been in any blacklist. I've submitted the domain information, delivery log overview, when the bounce started and false positive example yesterday 09 Jan 11:39 to noreply@connect.symantec.com, but haven't received a reply and no change in sending ability.
What other options do we have to get this resolved by Symantec?
t dsnDiag smtp;553 Message filtered. Refer to the Troubleshooting page at http://www.symanteccloud.com/troubleshooting for more information. (#5.7.1)
t dsnMta cluster3.eu.messagelabs.com (redacted)
X-SpamInfo: spam detected heuristically