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[Bug-mailfromd] dkim domain not aligned.

I think some dkim testers are updated and more strict because all of a sudden I am confrontend with this.

"DKIM domain does not align with RFC5322.From domain (a.com != b.com). Alignment mode: relaxed."


I was thinking of
- keeping a default provider sign domain to sign messages smtp.example.com for a.com, b.com, c.com

- then cname dkim txt from a.com to _domainkey.example.com
- test in mailfromd if for the current outgoing mail domain a.com a _domainkey.a.com exists, if so change the default sign domain to a.com

I don't really feel like creating for every domain customizations to enable dkim. Anyone can advise on how to deal with this? Is it possible to remove the alignment mode?