I thought I solved the problem of local-to-local delivery, when mails were tagged SPAM due to amavis failures...but here we go again.
Most of local-to-local mails fail within the following categories:
DMARC_FAIL_REJECT
RDNS_NONE
SPF_FAIL
For example, this domain has SPF 100% correct, but still gets SPF_FAIL score!
And mail was sent from userA to userB within same domain on same Zimbra server:
Code: Select all
amavis[28806]: (28806-08) spam_scan: score=43.451 autolearn=no autolearn_force=no tests=[BAYES_00=-1.9,DMARC_FAIL_REJECT=9,HEADER_FROM_DIFFERENT_DOMAINS=0.25,HTML_MESSAGE=0.001,HTML_MIME_NO_HTML_TAG=0.377,MIME_HTML_ONLY=0.723,RDNS_NONE=5,SPF_FAIL=30] recips=0
Might it be the main problem, that ZCS server is behind NAT and most of local domains do not resolve locally to LAN IP, but rather to public IP?
Should I install Zimbra's DNS cache?