Update 6/10/2025:
We detected phishing attack as follows:
First, attack bots take advantage of WEAK passwords to login.
Then, they exploit the form to Test Email Templates.
To address this, we're making the following changes:
- Add Rate Limits to our email server.
- Identify and Ban Malicious IPs.
- Add Security Keys to Cookies.
- Increase Password Strength.
- Force Password Reset for ALL.
- Only Allow Email Tests to User's Email Address.
- Notify users of logins to their accounts.
Update 6/5/2025:
We discovered malicious activity and added these IPs to our Block List:
85.28.127.229, 86.104.252.46, 105.129.231.29, 149.154.161.246, 160.164.210.78, 163.5.160.152, 196.81.91.148, 197.253.242.28, 197.253.217.204, 197.253.241.161
Update 6/4/2025:
We completed the Yahoo Sender Form on the Yahoo Sender Hub for assistance.
6/4/2025:
We are experiencing Yahoo blocking our emails to customers.
We're receiving errors from Yahoo email server:
421+4.7.0+[TSS04] +Messages+from+50.56.156.88+temporarily+deferred +due+to+unexpected+volume+or+user+complaints+-+4.16.55.1;+see+https://postmaster.yahooinc.com/error-codes 0 0 170 0 125 SMTP
Yahoo seems to be objecting to VOLUME as it's unlikely there are user complaints.
| 421 | 421 4.7.0 [TS01] Messages from x.x.x.x temporarily deferred due to user complaints – 4.16.55 | We’re seeing unusual traffic patterns from your server. |
| 421 | 421 4.7.0 [TS02] Messages from x.x.x.x temporarily deferred due to user complaints – 4.16.55 | We’re seeing unusual traffic patterns from your server or your mailings are generating complaints from Yahoo Mail users. |
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