Am 07.11.24 um 13:22 schrieb Fehlauer, Norbert via mailop:
Hi,thanks to all answers. So it is not allowed to use underscores in DKIM selectors but even large companies are using such selectors. So what's the usual case than? Try to convince the sender of their problem or ignore the error at all? I guess a typically "it depends" case. 😉
Treat DKIM signatures using such a key as invalid. If that leads to a rejection or quarantine per the sender organization's DMARC policy, so be it.
Cheers, Hans-Martin
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