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Hi Matt, Thanks for the advice. I've been sending a few test emails today (to a yahoo.co.uk account) and noticed some strange behaviour. In total, I've sent 3 test emails, which produced different results. Comments and headers are below for all three emails. The first email I sent got stuck in the SM spool with the usual 421 error ...

 All it takes is one or two complaints from Yahoo recipients to get your domain listed so all messages are "deferred". Remember, Yahoo is not just Yahoo, but all of the BELL / AT&T domains now as they were bought out by SBC Global dot net several years ago and yahoo's servers now process ALL mail for any AT&T or Baby ...

I'm finding that all emails to any btinternet.com or yahoo.com addresses are getting stuck in the spool with the following message. example@yahoo.co.uk: Pending 421 Message from (xx.xxx.xx.xx) temporarily deferred - 4.16.50. Please refer to http://help.yahoo.com/help/us/mail/defer/defer-06.html Sometimes these emails will be sent. Other ...

There are still issues connecting to smartermail 6 using outlook pop3. I have several users local (including myself) and a few remote. Outlook will produce an error occasionaly and won't connect to SMTP (this happens randomly) Ig you let it sit, or re-boot server outlook is fine for awhile then it happens again. During an 8 hour ...

Do you know what the default SmarterMail 5 resend settings are for messages sent out that get a response of "temporarily deferred"? Example: Failed Recipient: *person@yahoo.com* Reason: Remote host said: 421 Message from (*ip masked*) temporarily deferred - 4.16.50. Please refer to ...