On Sat, Jul 12, 2025 at 2:31 AM Martin Lesser via mailop <[email protected]> wrote:
> > Since weeks we have problems sending DKIM-signed newsletters to > > The yahoo-MTAs defer with "421 - ... due to unexpected volume ...". > That full SMTP message contains a link. I highly recommend following that. It not only contains helpful information but also a way to actually contact the yahoo postmaster team directly.
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