temporarily deferred due to unexpected volume or user complaints

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djrichwalker
Posts: 3
Joined: 18 Nov 2020 13:02

temporarily deferred due to unexpected volume or user complaints

Post by djrichwalker » 19 Nov 2020 16:36

We have been running EFA for the last 72 hours and we are having a problem sending emails to yahoo users.

4CcCMP4wJrz2SxBZ 7445 Thu Nov 19 08:21:53 name@mydomain.com
(host mta5.am0.yahoodns.net[67.195.204.72] said: 421 4.7.0 [TSS04] Messages from 45.8.225.84 temporarily deferred due to unexpected volume or user complaints - 4.16.55.1; see https://postmaster.verizonmedia.com/error-codes (in reply to MAIL FROM command))
myname@yahoo.com

I have PTR, SPF & DMARC, DKIM setup correctly. Anyone had the same problem?

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shawniverson
Posts: 3230
Joined: 13 Jan 2014 23:30
Location: Indianapolis, Indiana USA
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Re: temporarily deferred due to unexpected volume or user complaints

Post by shawniverson » 21 Nov 2020 14:51

This is a common problem with Verizon/Yahoo. You would have to limit the number of messages that are sent simultaneously to these domains to reduce the deferrals.

At the cost of performance, you can reduce the number of postfix processes down to one in /etc/postfix/master.cf

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