Could Someone From Yahoo Mail Please Contact Me

Our customers who use e-mail addresses are saying they aren't receiving invoices from our billing system. I checked our mail logs and I'm getting this:

Jan 12 16:11:34 account postfix/smtp[9802]: 1FA906C0E61: host[] said: 421 4.7.0 [TSS04] Messages temporarily deferred due to user complaints -; see (in reply to MAIL FROM command)

The link suggests several things to do and we've waited over 48 hours and still can't get invoices through.

The invoice server is definitely not compromised, and honestly I can't imagine there would be enough complaints to trigger a global block of that IP address, and we only have a small number of customers using e-mail addresses.


Try the mailop mailing list linked to in the past couple days.

Hey Matt,

Someone the other day posted about a mailing list for mail server operators. You might have better luck there. Info below.

mailop mailing list


Visit, probably clicking the “new sender application” option would trigger a ticket to yahoo. Someone there should be able to help.



What’s the IP of your sending mail server?

I can poke some people for you.