HostGator Yahoo Blacklist issue is several years old. Though majority of the issues are sorted out via CEO level interactions between HostGator and Yahoo, the problem still occurs sporadically for certain HostGator accounts.
Symptoms
When you try to send mails to a Yahoo email address via the HostGator SMTP server the mail bounces with a one of the standard error messages. However, there is absolutely no issue with sending mails to gMail, Hotmail etc.
HostGator Yahoo Mail Issue Solution
This problem happens because Yahoo had blacklisted a number of HostGator servers due to spam issues. The solution to the problem is to get this ban lifted by Yahoo via the following steps:
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