Hello,

I receive this message  ResponseCode 421, 4.7.0 Temporarily Deferred "2016"  when sending emails to @yahoo.com

It feels like this problem keeps happening for several years now, mostly because of SPAM and black lists issue.

If this problem won't be solved very quickly, and I won't be able to contact my costumers. I will have no choice but to ditch Zoho Mail !

Please update me ASAP, how this issue can be solved.

Thanks

David