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blog: postfix: link to a blacklist checker

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Colin 2022-04-07 20:25:03 +00:00
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content/blog/2022-04-05-systemd-nspawn-postfix.md
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@ -259,6 +259,8 @@ _dmarc TXT (
validate your DMARC record (and DKIM, SPF if you want): <https://dmarcian.com/dmarc-inspector/>.
confirm that your domain/IP isn't blacklisted: <https://multirbl.valli.org/>.
try sending/receiving mail: <https://www.appmaildev.com/en/dkim>.
if these fail, check `journalctl -u postfix`. if there's no indication of traffic, it may be that your ISP blocks outbound port 25.