<!DOCTYPE html><html><head><title></title><style type="text/css">p.MsoNormal,p.MsoNoSpacing{margin:0}</style></head><body><div><span class="font" style="font-family:verdana, sans-serif, sans-serif;">Yeah, good point (re "the other way around"). That would be one of those "you can't win either way" cases we often have in IT.</span><span class="font" style="font-family:verdana, sans-serif, sans-serif;"><br></span></div><div style="font-family:verdana, sans-serif;"><span class="font" style="font-family:verdana, sans-serif, sans-serif;"><br></span></div><div style="font-family:verdana, sans-serif;"><span class="font" style="font-family:verdana, sans-serif, sans-serif;">Hartmut</span><span class="font" style="font-family:verdana, sans-serif, sans-serif;"><br></span></div><div style="font-family:verdana, sans-serif;"><br></div><div style="font-family:verdana, sans-serif;"><br></div><div style="font-family:verdana, sans-serif;">On Thu 27 Oct 2022 at 08:14:35 -05:00, Alberto Abrao <<a href="mailto:alberto@abrao.net">alberto@abrao.net</a>> wrote:<br></div><blockquote type="cite" id="qt" style=""><div style="font-family:verdana, sans-serif;"><br></div><div style="font-family:verdana, sans-serif;">On 2022-10-27 05:34, Hartmut W Sager wrote:<br></div><div style="font-family:verdana, sans-serif;">> One quick thought does come to mind. Any chance you're using 2048-bit <br></div><div style="font-family:verdana, sans-serif;">> DKIM and that Yahoo can only work with 1024-bit DKIM? I encountered <br></div><div style="font-family:verdana, sans-serif;">> that in one of my study cases, where the receiving mail system can't <br></div><div style="font-family:verdana, sans-serif;">> verify.2048-bit DKIM.<br></div><div style="font-family:verdana, sans-serif;"><br></div><div style="font-family:verdana, sans-serif;"><br></div><div style="font-family:verdana, sans-serif;">Or the other way around. A few ESPs have been randomly reject 1024-bit <br></div><div style="font-family:verdana, sans-serif;">DKIM-signed messages, depending on the server where it lands on their end.<br></div><div style="font-family:verdana, sans-serif;"><br></div><div style="font-family:verdana, sans-serif;"><br></div><div style="font-family:verdana, sans-serif;">-Alberto<br></div><div style="font-family:verdana, sans-serif;"><br></div><div style="font-family:verdana, sans-serif;"><br></div></blockquote></body></html>