On 2022-10-27 Hartmut W Sager wrote:
One quick thought does come to mind. Any chance you're using 2048-bit DKIM and that Yahoo can only work with 1024-bit DKIM? I encountered that in one of my study cases, where the receiving mail system can't verify.2048-bit DKIM.
I emailed you (Hartmut) the headers privately (can do for others who want to help).
Pretty sure I'm not using 2048-bit, just the default stuff, didn't use the --bits option (manpage says default is 1k).
On 2022-10-27 Theodore Baschak wrote:
I really wouldn't be surprised to find out this is a problem on the yahoo end. I see tons of complaints about mail delivery to them on both the NANOG and mailops list.
This very well could be. We confirmed the exact same mail send to gmail passes their dkim.
I just want to make sure I'm covering all the bases on our end to ensure optimal deliverability.
Thanks!