![]() Your emails have become deprioritized due to the message content triggering our filters. You can check your status on Spamhaus’ site The sending IP is listed on a Spamhaus blacklist. Review your mailing lists, and remove any addresses that generate bounces.ĥ53 5.7.1 Connections not accepted from IP addresses on Spamhaus PBL The senders MAIL FROM address has been sending to excessive bouncing accounts (non-active, don’t exist). Your mail server is configured as an open relay or proxy.Ĥ51 VS1-MF Excessive unknown recipients – possible Open Relay (#4.4.5) This error indicates that our servers were busy and temporarily unable to process your transaction at the time of connection.Ĥ51 VS1-IP Excessive unknown recipients – possible Open Relay (#4.1.8) We’re seeing a high volume of e-mails from your server that are indicative of unsolicited mailings.Ĥ51 Resources temporarily not available – Please try again later We’re seeing unusual traffic patterns from your server or your mailings are generating complaints from Yahoo Mail users.Ĥ21 4.7.1 Messages from x.x.x.x permanently deferred. We’re seeing unusual traffic patterns from your server. The message content contained objectionable content, we’re seeing unusual traffic from your servers, or emails from your mail server are generating complaints from Yahoo Mail users.Ĥ21 4.7.0 Messages from x.x.x.x temporarily deferred due to user complaints – 4.16.55 See Other Yahoo SMTP Error Codes SMTP ErrorĤ21 Message temporarily deferred – Or 553 5.7.1 Connections will not be accepted from 1.2.3.4, Typically, when Yahoo blocks your public IP address, you may receive a bounce message with the following error message: 421 4.7.0 Messages from temporarily deferred due to user complaints If Yahoo rejected your message, the results under “Delivered to:” will display as “Undelivered.” Yahoo Error Codes Simply look up the results for Yahoo emails and see if Yahoo blocked your domain. Run an email deliverability test with GlockApps to see if Yahoo’s blocking your emails. Unlike public IP blacklists, there is no way to quickly perform a Yahoo blacklist check. These are often junk accounts that receive tons of spam messages. Some users can just forward all of their emails to Yahoo. This problem is often seen with shared hosting servers. ![]() If you forward an email to a Yahoo address and you then mark it as spam, Yahoo will penalize your server. Bulk forwarding spam emails to Yahoo users.Bulk emailing subscribers from a purchased email list.Emailing mailing lists, newsletters, forums, and blogs in bulk (even if they are opt-in).Compromised user accounts used to send spam.There are many ways your IP address can end up on the Yahoo block list. IPs listed in Spamhaus and other spam databases.But like most mailbox providers, Yahoo checks the sender’s IP reputation to decide if an email should be delivered and where it should be placed: Inbox or Spam. ![]() Yahoo does not disclose specific information about its email filtering requirements.
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