mstarks01 wrote:
Despite all this, they (seemingly randomly) send 4.16.50 codes to my server (deferred due to user complaints) and people don't get our mail.
This is not the same as mail going straight into the spam box. I routinely send from my linode to various yahoo accounts, and I've never seen one of those deferral codes.
You might (or might not) want to sign up for their feedback loop to see if your mails really are getting marked as spam by yahoo users.
http://help.yahoo.com/l/us/yahoo/mail/p ... /feedback/
EDIT:
OK, looking back at logs, I see I routinely get 4.16.50 deferral codes from yahoo, but they don't mention user complaints and they have never resulted in non-delivery. Most of the time, the message gets through on the first pass through all the MX records that came back - only on rare occasions does the deferral force postfix to retry a few minutes later.
EDIT^2:
For example:
Code:
Mar 3 22:35:56 xxx postfix/smtp[12478]: E9A8ED1D4: host c.mx.mail.yahoo.com[206.190.54.127] refused to talk to me: 421 Message from (xx.xx.xx.xx) temporarily deferred - 4.16.50. Please refer to http://help.yahoo.com/help/us/mail/defer/defer-06.html
Mar 3 22:35:56 xxx postfix/smtp[12478]: E9A8ED1D4: host h.mx.mail.yahoo.com[66.94.236.34] refused to talk to me: 421 Message from (xx.xx.xx.xx) temporarily deferred - 4.16.50. Please refer to http://help.yahoo.com/help/us/mail/defer/defer-06.html
Mar 3 22:35:56 xxx postfix/smtp[12478]: E9A8ED1D4: host a.mx.mail.yahoo.com[67.195.168.31] refused to talk to me: 421 Message from (xx.xx.xx.xx) temporarily deferred - 4.16.50. Please refer to http://help.yahoo.com/help/us/mail/defer/defer-06.html
Mar 3 22:35:58 xxx postfix/smtp[12478]: E9A8ED1D4: to=<xxxx@yahoo.com>, relay=b.mx.mail.yahoo.com[74.6.136.65]:25, delay=2.2, delays=0.49/0.01/1.1/0.52, dsn=2.0.0, status=sent (250 ok dirdel)
Mar 3 22:35:58 xxx postfix/qmgr[5788]: E9A8ED1D4: removed