Hello, I have had some occurrences of this error message when sending to yahoo managed domains. 421 4.7.0 [GL01] Message from (W.X.Y.Z) temporarily deferred - 4.16.50. Please refer to http://postmaster.yahoo.com/errors/postmaster-21.html
The mail generally passes at the next try, so that's not a big issue. However, the page http://postmaster.yahoo.com/errors/postmaster-21.html just redirects me to yahoo help as the page is not found. So perhaps it would be a good idea to make the defer message return a correct page. Best Regards
smime.p7s
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