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Hello BlueOnyx experts,
Has anyone suddenly had problems delivering email to some domains - mostly Hotmail, Outlook, and other Microsoft domains? Over the last couple of weeks - I find that I suddenly can't send email to Hotmail. It bounces back every time with a logged "service unavailable". And the bounce error message leads to a webpage with a very vague explanation - and essentially no way to fix it.
I'm also beginning to get multiple inquiries from my customers - when their users can't send mail to M$ domains. So I've got to find a resolution.
I've checked multiple sources, and neither the domain or the IP address is blacklisted. I've checked forward and reverse DNS records - all are correct. I already had a loose SPF record, now have tightened that up - no difference. So I went out to get info on DMARC - and created a DMARC record. Still no help. Every message fails.
I considered (briefly) DKIM - but that seems to be a challenging system, which appears to require changes to the MTA. And I just don't know if BlueOnyx supports DKIM, or will allow Sendmail to be modified to use DKIM.
So questions: Has anyone else experienced this problem with Hotmail/Outlook/Microsoft.com/etc? And has anyone found a resolution to the problem? I'd love to hear about your fix!
Second. Does anyone know if we can implement DKIM in BlueOnyx? I suspect that sooner or later - everyone will HAVE to go to DKIM. As more and more strict SPAM fighting measures are put in place - I believe DKIM will be the ultimate solution to combat spoofing FROM addressing.
Thanks everyone. I appreciate any suggestions on fixing this problem.
Chuck
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